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RedHat 9 (Linux i386) - man page for config (redhat section 3pm)

Config(3pm)			 Perl Programmers Reference Guide		      Config(3pm)

NAME
       Config - access Perl configuration information

SYNOPSIS
	   use Config;
	   if ($Config{'cc'} =~ /gcc/) {
	       print "built by gcc\n";
	   }

	   use Config qw(myconfig config_sh config_vars config_re);

	   print myconfig();

	   print config_sh();

	   print config_re();

	   config_vars(qw(osname archname));

DESCRIPTION
       The Config module contains all the information that was available to the "Configure" pro-
       gram at Perl build time (over 900 values).

       Shell variables from the config.sh file (written by Configure) are stored in the readonly-
       variable %Config, indexed by their names.

       Values stored in config.sh as 'undef' are returned as undefined values.	The perl "exists"
       function can be used to check if a named variable exists.

       myconfig()
	   Returns a textual summary of the major perl configuration values.  See also "-V" in
	   "Switches" in perlrun.

       config_sh()
	   Returns the entire perl configuration information in the form of the original con-
	   fig.sh shell variable assignment script.

       config_re($regex)
	   Like config_sh() but returns, as a list, only the config entries who's names match the
	   $regex.

       config_vars(@names)
	   Prints to STDOUT the values of the named configuration variable. Each is printed on a
	   separate line in the form:

	     name='value';

	   Names which are unknown are output as "name='UNKNOWN';".  See also "-V:name" in
	   "Switches" in perlrun.

EXAMPLE
       Here's a more sophisticated example of using %Config:

	   use Config;
	   use strict;

	   my %sig_num;
	   my @sig_name;
	   unless($Config{sig_name} && $Config{sig_num}) {
	       die "No sigs?";
	   } else {
	       my @names = split ' ', $Config{sig_name};
	       @sig_num{@names} = split ' ', $Config{sig_num};
	       foreach (@names) {
		   $sig_name[$sig_num{$_}] ||= $_;
	       }
	   }

	   print "signal #17 = $sig_name[17]\n";
	   if ($sig_num{ALRM}) {
	       print "SIGALRM is $sig_num{ALRM}\n";
	   }

WARNING
       Because this information is not stored within the perl executable itself it is possible
       (but unlikely) that the information does not relate to the actual perl binary which is
       being used to access it.

       The Config module is installed into the architecture and version specific library direc-
       tory ($Config{installarchlib}) and it checks the perl version number when loaded.

       The values stored in config.sh may be either single-quoted or double-quoted. Double-quoted
       strings are handy for those cases where you need to include escape sequences in the
       strings. To avoid runtime variable interpolation, any "$" and "@" characters are replaced
       by "\$" and "\@", respectively. This isn't foolproof, of course, so don't embed "\$" or
       "\@" in double-quoted strings unless you're willing to deal with the consequences. (The
       slashes will end up escaped and the "$" or "@" will trigger variable interpolation)

GLOSSARY
       Most "Config" variables are determined by the "Configure" script on platforms supported by
       it (which is most UNIX platforms).  Some platforms have custom-made "Config" variables,
       and may thus not have some of the variables described below, or may have extraneous vari-
       ables specific to that particular port.	See the port specific documentation in such
       cases.

       M

       "Mcc"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the Mcc program.	After Configure runs, the value is reset to a plain "Mcc" and is
	   not useful.

       P

       "PERL_REVISION"
	   From Oldsyms.U:

	   In a Perl version number such as 5.6.2, this is the 5.  This value is manually set in
	   patchlevel.h

       "PERL_SUBVERSION"
	   From Oldsyms.U:

	   In a Perl version number such as 5.6.2, this is the 2.  Values greater than 50 repre-
	   sent potentially unstable development subversions.  This value is manually set in
	   patchlevel.h

       "PERL_VERSION"
	   From Oldsyms.U:

	   In a Perl version number such as 5.6.2, this is the 6.  This value is manually set in
	   patchlevel.h

       _

       "_a"
	   From Unix.U:

	   This variable defines the extension used for ordinary library files.  For unix, it is
	   .a.	The . is included.  Other possible values include .lib.

       "_exe"
	   From Unix.U:

	   This variable defines the extension used for executable files.  "DJGPP", Cygwin and
	   OS/2 use .exe.  Stratus "VOS" uses .pm.  On operating systems which do not require a
	   specific extension for executable files, this variable is empty.

       "_o"
	   From Unix.U:

	   This variable defines the extension used for object files.  For unix, it is .o.  The .
	   is included.  Other possible values include .obj.

       a

       "afs"
	   From afs.U:

	   This variable is set to "true" if "AFS" (Andrew File System) is used on the system,
	   "false" otherwise.  It is possible to override this with a hint value or command line
	   option, but you'd better know what you are doing.

       "afsroot"
	   From afs.U:

	   This variable is by default set to /afs. In the unlikely case this is not the correct
	   root, it is possible to override this with a hint value or command line option.  This
	   will be used in subsequent tests for AFSness in the Perl configure and test process.

       "alignbytes"
	   From alignbytes.U:

	   This variable holds the number of bytes required to align a double-- or a long double
	   when applicable. Usual values are 2, 4 and 8.  The default is eight, for safety.

       "ansi2knr"
	   From ansi2knr.U:

	   This variable is set if the user needs to run ansi2knr.  Currently, this is not sup-
	   ported, so we just abort.

       "aphostname"
	   From d_gethname.U:

	   This variable contains the command which can be used to compute the host name. The
	   command is fully qualified by its absolute path, to make it safe when used by a
	   process with super-user privileges.

       "api_revision"
	   From patchlevel.U:

	   The three variables, api_revision, api_version, and api_subversion, specify the ver-
	   sion of the oldest perl binary compatible with the present perl.  In a full version
	   string such as 5.6.1, api_revision is the 5.  Prior to 5.5.640, the format was a
	   floating point number, like 5.00563.

	   perl.c:incpush() and lib/lib.pm will automatically search in $sitelib/.. for older
	   directories back to the limit specified by these api_ variables.  This is only useful
	   if you have a perl library directory tree structured like the default one.  See
	   "INSTALL" for how this works.  The versioned site_perl directory was introduced in
	   5.005, so that is the lowest possible value.  The version list appropriate for the
	   current system is determined in inc_version_list.U.

	   "XXX" To do:  Since compatibility can depend on compile time options (such as bincom-
	   pat, longlong, etc.) it should (perhaps) be set by Configure, but currently it isn't.
	   Currently, we read a hard-wired value from patchlevel.h.  Perhaps what we ought to do
	   is take the hard-wired value from patchlevel.h but then modify it if the current Con-
	   figure options warrant.  patchlevel.h then would use an #ifdef guard.

       "api_subversion"
	   From patchlevel.U:

	   The three variables, api_revision, api_version, and api_subversion, specify the ver-
	   sion of the oldest perl binary compatible with the present perl.  In a full version
	   string such as 5.6.1, api_subversion is the 1.  See api_revision for full details.

       "api_version"
	   From patchlevel.U:

	   The three variables, api_revision, api_version, and api_subversion, specify the ver-
	   sion of the oldest perl binary compatible with the present perl.  In a full version
	   string such as 5.6.1, api_version is the 6.	See api_revision for full details.  As a
	   special case, 5.5.0 is rendered in the old-style as 5.005.  (In the 5.005_0x mainte-
	   nance series, this was the only versioned directory in $sitelib.)

       "api_versionstring"
	   From patchlevel.U:

	   This variable combines api_revision, api_version, and api_subversion in a format such
	   as 5.6.1 (or 5_6_1) suitable for use as a directory name.  This is filesystem depen-
	   dent.

       "ar"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the ar program.  After Configure runs, the value is reset to a plain "ar" and is
	   not useful.

       "archlib"
	   From archlib.U:

	   This variable holds the name of the directory in which the user wants to put architec-
	   ture-dependent public library files for $package.  It is most often a local directory
	   such as /usr/local/lib.  Programs using this variable must be prepared to deal with
	   filename expansion.

       "archlibexp"
	   From archlib.U:

	   This variable is the same as the archlib variable, but is filename expanded at config-
	   uration time, for convenient use.

       "archname64"
	   From use64bits.U:

	   This variable is used for the 64-bitness part of $archname.

       "archname"
	   From archname.U:

	   This variable is a short name to characterize the current architecture.  It is used
	   mainly to construct the default archlib.

       "archobjs"
	   From Unix.U:

	   This variable defines any additional objects that must be linked in with the program
	   on this architecture.  On unix, it is usually empty.  It is typically used to include
	   emulations of unix calls or other facilities.  For perl on OS/2, for example, this
	   would include os2/os2.obj.

       "asctime_r_proto"
	   From d_asctime_r.U:

	   This variable encodes the prototype of asctime_r.  It is zero if d_asctime_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_asctime_r is defined.

       "awk"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the awk program.	After Configure runs, the value is reset to a plain "awk" and is
	   not useful.

       b

       "baserev"
	   From baserev.U:

	   The base revision level of this package, from the .package file.

       "bash"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "bin"
	   From bin.U:

	   This variable holds the name of the directory in which the user wants to put publicly
	   executable images for the package in question.  It is most often a local directory
	   such as /usr/local/bin. Programs using this variable must be prepared to deal with
	   ~name substitution.

       "binexp"
	   From bin.U:

	   This is the same as the bin variable, but is filename expanded at configuration time,
	   for use in your makefiles.

       "bison"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the bison program.  After Configure runs, the value is reset to a plain "bison" and
	   is not useful.

       "byacc"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the byacc program.  After Configure runs, the value is reset to a plain "byacc" and
	   is not useful.

       "byteorder"
	   From byteorder.U:

	   This variable holds the byte order in a "UV". In the following, larger digits indicate
	   more significance.  The variable byteorder is either 4321 on a big-endian machine, or
	   1234 on a little-endian, or 87654321 on a Cray ... or 3412 with weird order !

       c

       "c" From n.U:

	   This variable contains the \c string if that is what causes the echo command to sup-
	   press newline.  Otherwise it is null.  Correct usage is $echo $n "prompt for a ques-
	   tion: $c".

       "castflags"
	   From d_castneg.U:

	   This variable contains a flag that precise difficulties the compiler has casting odd
	   floating values to unsigned long: 0 = ok 1 = couldn't cast < 0 2 = couldn't cast >=
	   0x80000000 4 = couldn't cast in argument expression list

       "cat"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the cat program.	After Configure runs, the value is reset to a plain "cat" and is
	   not useful.

       "cc"
	   From cc.U:

	   This variable holds the name of a command to execute a C compiler which can resolve
	   multiple global references that happen to have the same name.  Usual values are "cc"
	   and "gcc".  Fervent "ANSI" compilers may be called "c89".  "AIX" has xlc.

       "cccdlflags"
	   From dlsrc.U:

	   This variable contains any special flags that might need to be passed with "cc -c" to
	   compile modules to be used to create a shared library that will be used for dynamic
	   loading.  For hpux, this should be +z.  It is up to the makefile to use it.

       "ccdlflags"
	   From dlsrc.U:

	   This variable contains any special flags that might need to be passed to cc to link
	   with a shared library for dynamic loading.  It is up to the makefile to use it.  For
	   sunos 4.1, it should be empty.

       "ccflags"
	   From ccflags.U:

	   This variable contains any additional C compiler flags desired by the user.	It is up
	   to the Makefile to use this.

       "ccflags_uselargefiles"
	   From uselfs.U:

	   This variable contains the compiler flags needed by large file builds and added to
	   ccflags by hints files.

       "ccname"
	   From Checkcc.U:

	   This can set either by hints files or by Configure.	If using gcc, this is gcc, and if
	   not, usually equal to cc, unimpressive, no?	Some platforms, however, make good use of
	   this by storing the flavor of the C compiler being used here.  For example if using
	   the Sun WorkShop suite, ccname will be "workshop".

       "ccsymbols"
	   From Cppsym.U:

	   The variable contains the symbols defined by the C compiler alone.  The symbols
	   defined by cpp or by cc when it calls cpp are not in this list, see cppsymbols and
	   cppccsymbols.  The list is a space-separated list of symbol=value tokens.

       "ccversion"
	   From Checkcc.U:

	   This can set either by hints files or by Configure.	If using a (non-gcc) vendor cc,
	   this variable may contain a version for the compiler.

       "cf_by"
	   From cf_who.U:

	   Login name of the person who ran the Configure script and answered the questions. This
	   is used to tag both config.sh and config_h.SH.

       "cf_email"
	   From cf_email.U:

	   Electronic mail address of the person who ran Configure. This can be used by units
	   that require the user's e-mail, like MailList.U.

       "cf_time"
	   From cf_who.U:

	   Holds the output of the "date" command when the configuration file was produced. This
	   is used to tag both config.sh and config_h.SH.

       "charsize"
	   From charsize.U:

	   This variable contains the value of the "CHARSIZE" symbol, which indicates to the C
	   program how many bytes there are in a character.

       "chgrp"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "chmod"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the chmod program.  After Configure runs, the value is reset to a plain "chmod" and
	   is not useful.

       "chown"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "clocktype"
	   From d_times.U:

	   This variable holds the type returned by times(). It can be long, or clock_t on "BSD"
	   sites (in which case <sys/types.h> should be included).

       "comm"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the comm program.  After Configure runs, the value is reset to a plain "comm" and
	   is not useful.

       "compress"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "contains"
	   From contains.U:

	   This variable holds the command to do a grep with a proper return status.  On most
	   sane systems it is simply "grep".  On insane systems it is a grep followed by a cat
	   followed by a test.	This variable is primarily for the use of other Configure units.

       "cp"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the cp program.  After Configure runs, the value is reset to a plain "cp" and is
	   not useful.

       "cpio"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "cpp"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the cpp program.	After Configure runs, the value is reset to a plain "cpp" and is
	   not useful.

       "cpp_stuff"
	   From cpp_stuff.U:

	   This variable contains an identification of the catenation mechanism used by the C
	   preprocessor.

       "cppccsymbols"
	   From Cppsym.U:

	   The variable contains the symbols defined by the C compiler when it calls cpp.  The
	   symbols defined by the cc alone or cpp alone are not in this list, see ccsymbols and
	   cppsymbols.	The list is a space-separated list of symbol=value tokens.

       "cppflags"
	   From ccflags.U:

	   This variable holds the flags that will be passed to the C pre- processor. It is up to
	   the Makefile to use it.

       "cpplast"
	   From cppstdin.U:

	   This variable has the same functionality as cppminus, only it applies to cpprun and
	   not cppstdin.

       "cppminus"
	   From cppstdin.U:

	   This variable contains the second part of the string which will invoke the C pre-
	   processor on the standard input and produce to standard output.  This variable will
	   have the value "-" if cppstdin needs a minus to specify standard input, otherwise the
	   value is "".

       "cpprun"
	   From cppstdin.U:

	   This variable contains the command which will invoke a C preprocessor on standard
	   input and put the output to stdout. It is guaranteed not to be a wrapper and may be a
	   null string if no preprocessor can be made directly available. This preprocessor might
	   be different from the one used by the C compiler. Don't forget to append cpplast after
	   the preprocessor options.

       "cppstdin"
	   From cppstdin.U:

	   This variable contains the command which will invoke the C preprocessor on standard
	   input and put the output to stdout.	It is primarily used by other Configure units
	   that ask about preprocessor symbols.

       "cppsymbols"
	   From Cppsym.U:

	   The variable contains the symbols defined by the C preprocessor alone.  The symbols
	   defined by cc or by cc when it calls cpp are not in this list, see ccsymbols and
	   cppccsymbols.  The list is a space-separated list of symbol=value tokens.

       "crypt_r_proto"
	   From d_crypt_r.U:

	   This variable encodes the prototype of crypt_r.  It is zero if d_crypt_r is undef, and
	   one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_crypt_r is defined.

       "cryptlib"
	   From d_crypt.U:

	   This variable holds -lcrypt or the path to a libcrypt.a archive if the crypt() func-
	   tion is not defined in the standard C library. It is up to the Makefile to use this.

       "csh"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the csh program.	After Configure runs, the value is reset to a plain "csh" and is
	   not useful.

       "ctermid_r_proto"
	   From d_ctermid_r.U:

	   This variable encodes the prototype of ctermid_r.  It is zero if d_ctermid_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_ctermid_r is defined.

       "ctime_r_proto"
	   From d_ctime_r.U:

	   This variable encodes the prototype of ctime_r.  It is zero if d_ctime_r is undef, and
	   one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_ctime_r is defined.

       d

       "d_Gconvert"
	   From d_gconvert.U:

	   This variable holds what Gconvert is defined as to convert floating point numbers into
	   strings.  By default, Configure sets "this" macro to use the first of gconvert, gcvt,
	   or sprintf that pass sprintf-%g-like behaviour tests.  If perl is using long doubles,
	   the macro uses the first of the following functions that pass Configure's tests:
	   qgcvt, sprintf (if Configure knows how to make sprintf format long doubles--see
	   sPRIgldbl), gconvert, gcvt, and sprintf (casting to double).  The gconvert_preference
	   and gconvert_ld_preference variables can be used to alter Configure's preferences, for
	   doubles and long doubles, respectively.  If present, they contain a space-separated
	   list of one or more of the above function names in the order they should be tried.

	   d_Gconvert may be set to override Configure with a platform- specific function.  If
	   this function expects a double, a different value may need to be set by the uselong-
	   double.cbu call-back unit so that long doubles can be formatted without loss of preci-
	   sion.

       "d_PRIEUldbl"
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
	   stdio has a symbol to print long doubles.  The "U" in the name is to separate this
	   from d_PRIeldbl so that even case-blind systems can see the difference.

       "d_PRIFUldbl"
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
	   stdio has a symbol to print long doubles.  The "U" in the name is to separate this
	   from d_PRIfldbl so that even case-blind systems can see the difference.

       "d_PRIGUldbl"
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
	   stdio has a symbol to print long doubles.  The "U" in the name is to separate this
	   from d_PRIgldbl so that even case-blind systems can see the difference.

       "d_PRIXU64"
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIXU64 symbol, which indiciates that
	   stdio has a symbol to print 64-bit hExADECimAl numbers.  The "U" in the name is to
	   separate this from d_PRIx64 so that even case-blind systems can see the difference.

       "d_PRId64"
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRId64 symbol, which indiciates that
	   stdio has a symbol to print 64-bit decimal numbers.

       "d_PRIeldbl"
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
	   stdio has a symbol to print long doubles.

       "d_PRIfldbl"
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
	   stdio has a symbol to print long doubles.

       "d_PRIgldbl"
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
	   stdio has a symbol to print long doubles.

       "d_PRIi64"
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIi64 symbol, which indiciates that
	   stdio has a symbol to print 64-bit decimal numbers.

       "d_PRIo64"
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIo64 symbol, which indiciates that
	   stdio has a symbol to print 64-bit octal numbers.

       "d_PRIu64"
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIu64 symbol, which indiciates that
	   stdio has a symbol to print 64-bit unsigned decimal numbers.

       "d_PRIx64"
	   From quadfio.U:

	   This variable conditionally defines the PERL_PRIx64 symbol, which indiciates that
	   stdio has a symbol to print 64-bit hexadecimal numbers.

       "d_SCNfldbl"
	   From longdblfio.U:

	   This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
	   stdio has a symbol to scan long doubles.

       "d__fwalk"
	   From d__fwalk.U:

	   This variable conditionally defines "HAS__FWALK" if _fwalk() is available to apply a
	   function to all the file handles.

       "d_access"
	   From d_access.U:

	   This variable conditionally defines "HAS_ACCESS" if the access() system call is avail-
	   able to check for access permissions using real IDs.

       "d_accessx"
	   From d_accessx.U:

	   This variable conditionally defines the "HAS_ACCESSX" symbol, which indicates to the C
	   program that the accessx() routine is available.

       "d_alarm"
	   From d_alarm.U:

	   This variable conditionally defines the "HAS_ALARM" symbol, which indicates to the C
	   program that the alarm() routine is available.

       "d_archlib"
	   From archlib.U:

	   This variable conditionally defines "ARCHLIB" to hold the pathname of architecture-
	   dependent library files for $package.  If $archlib is the same as $privlib, then this
	   is set to undef.

       "d_asctime_r"
	   From d_asctime_r.U:

	   This variable conditionally defines the "HAS_ASCTIME_R" symbol, which indicates to the
	   C program that the asctime_r() routine is available.

       "d_atolf"
	   From atolf.U:

	   This variable conditionally defines the "HAS_ATOLF" symbol, which indicates to the C
	   program that the atolf() routine is available.

       "d_atoll"
	   From atoll.U:

	   This variable conditionally defines the "HAS_ATOLL" symbol, which indicates to the C
	   program that the atoll() routine is available.

       "d_attribut"
	   From d_attribut.U:

	   This variable conditionally defines "HASATTRIBUTE", which indicates the C compiler can
	   check for function attributes, such as printf formats.

       "d_bcmp"
	   From d_bcmp.U:

	   This variable conditionally defines the "HAS_BCMP" symbol if the bcmp() routine is
	   available to compare strings.

       "d_bcopy"
	   From d_bcopy.U:

	   This variable conditionally defines the "HAS_BCOPY" symbol if the bcopy() routine is
	   available to copy strings.

       "d_bsd"
	   From Guess.U:

	   This symbol conditionally defines the symbol "BSD" when running on a "BSD" system.

       "d_bsdgetpgrp"
	   From d_getpgrp.U:

	   This variable conditionally defines "USE_BSD_GETPGRP" if getpgrp needs one arguments
	   whereas "USG" one needs none.

       "d_bsdsetpgrp"
	   From d_setpgrp.U:

	   This variable conditionally defines "USE_BSD_SETPGRP" if setpgrp needs two arguments
	   whereas "USG" one needs none.  See also d_setpgid for a "POSIX" interface.

       "d_bzero"
	   From d_bzero.U:

	   This variable conditionally defines the "HAS_BZERO" symbol if the bzero() routine is
	   available to set memory to 0.

       "d_casti32"
	   From d_casti32.U:

	   This variable conditionally defines CASTI32, which indicates whether the C compiler
	   can cast large floats to 32-bit ints.

       "d_castneg"
	   From d_castneg.U:

	   This variable conditionally defines "CASTNEG", which indicates wether the C compiler
	   can cast negative float to unsigned.

       "d_charvspr"
	   From d_vprintf.U:

	   This variable conditionally defines "CHARVSPRINTF" if this system has vsprintf return-
	   ing type (char*).  The trend seems to be to declare it as "int vsprintf()".

       "d_chown"
	   From d_chown.U:

	   This variable conditionally defines the "HAS_CHOWN" symbol, which indicates to the C
	   program that the chown() routine is available.

       "d_chroot"
	   From d_chroot.U:

	   This variable conditionally defines the "HAS_CHROOT" symbol, which indicates to the C
	   program that the chroot() routine is available.

       "d_chsize"
	   From d_chsize.U:

	   This variable conditionally defines the "CHSIZE" symbol, which indicates to the C pro-
	   gram that the chsize() routine is available to truncate files.  You might need a -lx
	   to get this routine.

       "d_class"
	   From d_class.U:

	   This variable conditionally defines the "HAS_CLASS" symbol, which indicates to the C
	   program that the class() routine is available.

       "d_closedir"
	   From d_closedir.U:

	   This variable conditionally defines "HAS_CLOSEDIR" if closedir() is available.

       "d_cmsghdr_s"
	   From d_cmsghdr_s.U:

	   This variable conditionally defines the "HAS_STRUCT_CMSGHDR" symbol, which indicates
	   that the struct cmsghdr is supported.

       "d_const"
	   From d_const.U:

	   This variable conditionally defines the "HASCONST" symbol, which indicates to the C
	   program that this C compiler knows about the const type.

       "d_crypt"
	   From d_crypt.U:

	   This variable conditionally defines the "CRYPT" symbol, which indicates to the C pro-
	   gram that the crypt() routine is available to encrypt passwords and the like.

       "d_crypt_r"
	   From d_crypt_r.U:

	   This variable conditionally defines the "HAS_CRYPT_R" symbol, which indicates to the C
	   program that the crypt_r() routine is available.

       "d_csh"
	   From d_csh.U:

	   This variable conditionally defines the "CSH" symbol, which indicates to the C program
	   that the C-shell exists.

       "d_ctermid_r"
	   From d_ctermid_r.U:

	   This variable conditionally defines the "HAS_CTERMID_R" symbol, which indicates to the
	   C program that the ctermid_r() routine is available.

       "d_ctime_r"
	   From d_ctime_r.U:

	   This variable conditionally defines the "HAS_CTIME_R" symbol, which indicates to the C
	   program that the ctime_r() routine is available.

       "d_cuserid"
	   From d_cuserid.U:

	   This variable conditionally defines the "HAS_CUSERID" symbol, which indicates to the C
	   program that the cuserid() routine is available to get character login names.

       "d_dbl_dig"
	   From d_dbl_dig.U:

	   This variable conditionally defines d_dbl_dig if this system's header files provide
	   "DBL_DIG", which is the number of significant digits in a double precision number.

       "d_dbminitproto"
	   From d_dbminitproto.U:

	   This variable conditionally defines the "HAS_DBMINIT_PROTO" symbol, which indicates to
	   the C program that the system provides a prototype for the dbminit() function.  Other-
	   wise, it is up to the program to supply one.

       "d_difftime"
	   From d_difftime.U:

	   This variable conditionally defines the "HAS_DIFFTIME" symbol, which indicates to the
	   C program that the difftime() routine is available.

       "d_dirfd"
	   From d_dirfd.U:

	   This variable conditionally defines the "HAS_DIRFD" constant, which indicates to the C
	   program that dirfd() is available to return the file descriptor of a directory stream.

       "d_dirnamlen"
	   From i_dirent.U:

	   This variable conditionally defines "DIRNAMLEN", which indicates to the C program that
	   the length of directory entry names is provided by a d_namelen field.

       "d_dlerror"
	   From d_dlerror.U:

	   This variable conditionally defines the "HAS_DLERROR" symbol, which indicates to the C
	   program that the dlerror() routine is available.

       "d_dlopen"
	   From d_dlopen.U:

	   This variable conditionally defines the "HAS_DLOPEN" symbol, which indicates to the C
	   program that the dlopen() routine is available.

       "d_dlsymun"
	   From d_dlsymun.U:

	   This variable conditionally defines "DLSYM_NEEDS_UNDERSCORE", which indicates that we
	   need to prepend an underscore to the symbol name before calling dlsym().

       "d_dosuid"
	   From d_dosuid.U:

	   This variable conditionally defines the symbol "DOSUID", which tells the C program
	   that it should insert setuid emulation code on hosts which have setuid #! scripts dis-
	   abled.

       "d_drand48_r"
	   From d_drand48_r.U:

	   This variable conditionally defines the HAS_DRAND48_R symbol, which indicates to the C
	   program that the drand48_r() routine is available.

       "d_drand48proto"
	   From d_drand48proto.U:

	   This variable conditionally defines the HAS_DRAND48_PROTO symbol, which indicates to
	   the C program that the system provides a prototype for the drand48() function.  Other-
	   wise, it is up to the program to supply one.

       "d_dup2"
	   From d_dup2.U:

	   This variable conditionally defines HAS_DUP2 if dup2() is available to duplicate file
	   descriptors.

       "d_eaccess"
	   From d_eaccess.U:

	   This variable conditionally defines the "HAS_EACCESS" symbol, which indicates to the C
	   program that the eaccess() routine is available.

       "d_endgrent"
	   From d_endgrent.U:

	   This variable conditionally defines the "HAS_ENDGRENT" symbol, which indicates to the
	   C program that the endgrent() routine is available for sequential access of the group
	   database.

       "d_endgrent_r"
	   From d_endgrent_r.U:

	   This variable conditionally defines the "HAS_ENDGRENT_R" symbol, which indicates to
	   the C program that the endgrent_r() routine is available.

       "d_endhent"
	   From d_endhent.U:

	   This variable conditionally defines "HAS_ENDHOSTENT" if endhostent() is available to
	   close whatever was being used for host queries.

       "d_endhostent_r"
	   From d_endhostent_r.U:

	   This variable conditionally defines the "HAS_ENDHOSTENT_R" symbol, which indicates to
	   the C program that the endhostent_r() routine is available.

       "d_endnent"
	   From d_endnent.U:

	   This variable conditionally defines "HAS_ENDNETENT" if endnetent() is available to
	   close whatever was being used for network queries.

       "d_endnetent_r"
	   From d_endnetent_r.U:

	   This variable conditionally defines the "HAS_ENDNETENT_R" symbol, which indicates to
	   the C program that the endnetent_r() routine is available.

       "d_endpent"
	   From d_endpent.U:

	   This variable conditionally defines "HAS_ENDPROTOENT" if endprotoent() is available to
	   close whatever was being used for protocol queries.

       "d_endprotoent_r"
	   From d_endprotoent_r.U:

	   This variable conditionally defines the "HAS_ENDPROTOENT_R" symbol, which indicates to
	   the C program that the endprotoent_r() routine is available.

       "d_endpwent"
	   From d_endpwent.U:

	   This variable conditionally defines the "HAS_ENDPWENT" symbol, which indicates to the
	   C program that the endpwent() routine is available for sequential access of the passwd
	   database.

       "d_endpwent_r"
	   From d_endpwent_r.U:

	   This variable conditionally defines the "HAS_ENDPWENT_R" symbol, which indicates to
	   the C program that the endpwent_r() routine is available.

       "d_endsent"
	   From d_endsent.U:

	   This variable conditionally defines "HAS_ENDSERVENT" if endservent() is available to
	   close whatever was being used for service queries.

       "d_endservent_r"
	   From d_endservent_r.U:

	   This variable conditionally defines the "HAS_ENDSERVENT_R" symbol, which indicates to
	   the C program that the endservent_r() routine is available.

       "d_eofnblk"
	   From nblock_io.U:

	   This variable conditionally defines "EOF_NONBLOCK" if "EOF" can be seen when reading
	   from a non-blocking I/O source.

       "d_eunice"
	   From Guess.U:

	   This variable conditionally defines the symbols "EUNICE" and "VAX", which alerts the C
	   program that it must deal with ideosyncracies of "VMS".

       "d_fchdir"
	   From d_fchdir.U:

	   This variable conditionally defines the "HAS_FCHDIR" symbol, which indicates to the C
	   program that the fchdir() routine is available.

       "d_fchmod"
	   From d_fchmod.U:

	   This variable conditionally defines the "HAS_FCHMOD" symbol, which indicates to the C
	   program that the fchmod() routine is available to change mode of opened files.

       "d_fchown"
	   From d_fchown.U:

	   This variable conditionally defines the "HAS_FCHOWN" symbol, which indicates to the C
	   program that the fchown() routine is available to change ownership of opened files.

       "d_fcntl"
	   From d_fcntl.U:

	   This variable conditionally defines the "HAS_FCNTL" symbol, and indicates whether the
	   fcntl() function exists

       "d_fcntl_can_lock"
	   From d_fcntl_can_lock.U:

	   This variable conditionally defines the "FCNTL_CAN_LOCK" symbol and indicates whether
	   file locking with fcntl() works.

       "d_fd_macros"
	   From d_fd_set.U:

	   This variable contains the eventual value of the "HAS_FD_MACROS" symbol, which indi-
	   cates if your C compiler knows about the macros which manipulate an fd_set.

       "d_fd_set"
	   From d_fd_set.U:

	   This variable contains the eventual value of the "HAS_FD_SET" symbol, which indicates
	   if your C compiler knows about the fd_set typedef.

       "d_fds_bits"
	   From d_fd_set.U:

	   This variable contains the eventual value of the "HAS_FDS_BITS" symbol, which indi-
	   cates if your fd_set typedef contains the fds_bits member.  If you have an fd_set
	   typedef, but the dweebs who installed it did a half-fast job and neglected to provide
	   the macros to manipulate an fd_set, "HAS_FDS_BITS" will let us know how to fix the
	   gaffe.

       "d_fgetpos"
	   From d_fgetpos.U:

	   This variable conditionally defines "HAS_FGETPOS" if fgetpos() is available to get the
	   file position indicator.

       "d_finite"
	   From d_finite.U:

	   This variable conditionally defines the "HAS_FINITE" symbol, which indicates to the C
	   program that the finite() routine is available.

       "d_finitel"
	   From d_finitel.U:

	   This variable conditionally defines the "HAS_FINITEL" symbol, which indicates to the C
	   program that the finitel() routine is available.

       "d_flexfnam"
	   From d_flexfnam.U:

	   This variable conditionally defines the "FLEXFILENAMES" symbol, which indicates that
	   the system supports filenames longer than 14 characters.

       "d_flock"
	   From d_flock.U:

	   This variable conditionally defines "HAS_FLOCK" if flock() is available to do file
	   locking.

       "d_flockproto"
	   From d_flockproto.U:

	   This variable conditionally defines the "HAS_FLOCK_PROTO" symbol, which indicates to
	   the C program that the system provides a prototype for the flock() function.  Other-
	   wise, it is up to the program to supply one.

       "d_fork"
	   From d_fork.U:

	   This variable conditionally defines the "HAS_FORK" symbol, which indicates to the C
	   program that the fork() routine is available.

       "d_fp_class"
	   From d_fp_class.U:

	   This variable conditionally defines the "HAS_FP_CLASS" symbol, which indicates to the
	   C program that the fp_class() routine is available.

       "d_fpathconf"
	   From d_pathconf.U:

	   This variable conditionally defines the "HAS_FPATHCONF" symbol, which indicates to the
	   C program that the pathconf() routine is available to determine file-system related
	   limits and options associated with a given open file descriptor.

       "d_fpclass"
	   From d_fpclass.U:

	   This variable conditionally defines the "HAS_FPCLASS" symbol, which indicates to the C
	   program that the fpclass() routine is available.

       "d_fpclassify"
	   From d_fpclassify.U:

	   This variable conditionally defines the "HAS_FPCLASSIFY" symbol, which indicates to
	   the C program that the fpclassify() routine is available.

       "d_fpclassl"
	   From d_fpclassl.U:

	   This variable conditionally defines the "HAS_FPCLASSL" symbol, which indicates to the
	   C program that the fpclassl() routine is available.

       "d_fpos64_t"
	   From d_fpos64_t.U:

	   This symbol will be defined if the C compiler supports fpos64_t.

       "d_frexpl"
	   From d_frexpl.U:

	   This variable conditionally defines the "HAS_FREXPL" symbol, which indicates to the C
	   program that the frexpl() routine is available.

       "d_fs_data_s"
	   From d_fs_data_s.U:

	   This variable conditionally defines the "HAS_STRUCT_FS_DATA" symbol, which indicates
	   that the struct fs_data is supported.

       "d_fseeko"
	   From d_fseeko.U:

	   This variable conditionally defines the "HAS_FSEEKO" symbol, which indicates to the C
	   program that the fseeko() routine is available.

       "d_fsetpos"
	   From d_fsetpos.U:

	   This variable conditionally defines "HAS_FSETPOS" if fsetpos() is available to set the
	   file position indicator.

       "d_fstatfs"
	   From d_fstatfs.U:

	   This variable conditionally defines the "HAS_FSTATFS" symbol, which indicates to the C
	   program that the fstatfs() routine is available.

       "d_fstatvfs"
	   From d_statvfs.U:

	   This variable conditionally defines the "HAS_FSTATVFS" symbol, which indicates to the
	   C program that the fstatvfs() routine is available.

       "d_fsync"
	   From d_fsync.U:

	   This variable conditionally defines the "HAS_FSYNC" symbol, which indicates to the C
	   program that the fsync() routine is available.

       "d_ftello"
	   From d_ftello.U:

	   This variable conditionally defines the "HAS_FTELLO" symbol, which indicates to the C
	   program that the ftello() routine is available.

       "d_ftime"
	   From d_ftime.U:

	   This variable conditionally defines the "HAS_FTIME" symbol, which indicates that the
	   ftime() routine exists.  The ftime() routine is basically a sub-second accuracy clock.

       "d_getcwd"
	   From d_getcwd.U:

	   This variable conditionally defines the "HAS_GETCWD" symbol, which indicates to the C
	   program that the getcwd() routine is available to get the current working directory.

       "d_getespwnam"
	   From d_getespwnam.U:

	   This variable conditionally defines "HAS_GETESPWNAM" if getespwnam() is available to
	   retrieve enchanced (shadow) password entries by name.

       "d_getfsstat"
	   From d_getfsstat.U:

	   This variable conditionally defines the "HAS_GETFSSTAT" symbol, which indicates to the
	   C program that the getfsstat() routine is available.

       "d_getgrent"
	   From d_getgrent.U:

	   This variable conditionally defines the "HAS_GETGRENT" symbol, which indicates to the
	   C program that the getgrent() routine is available for sequential access of the group
	   database.

       "d_getgrent_r"
	   From d_getgrent_r.U:

	   This variable conditionally defines the "HAS_GETGRENT_R" symbol, which indicates to
	   the C program that the getgrent_r() routine is available.

       "d_getgrgid_r"
	   From d_getgrgid_r.U:

	   This variable conditionally defines the "HAS_GETGRGID_R" symbol, which indicates to
	   the C program that the getgrgid_r() routine is available.

       "d_getgrnam_r"
	   From d_getgrnam_r.U:

	   This variable conditionally defines the "HAS_GETGRNAM_R" symbol, which indicates to
	   the C program that the getgrnam_r() routine is available.

       "d_getgrps"
	   From d_getgrps.U:

	   This variable conditionally defines the "HAS_GETGROUPS" symbol, which indicates to the
	   C program that the getgroups() routine is available to get the list of process groups.

       "d_gethbyaddr"
	   From d_gethbyad.U:

	   This variable conditionally defines the "HAS_GETHOSTBYADDR" symbol, which indicates to
	   the C program that the gethostbyaddr() routine is available to look up hosts by their
	   "IP" addresses.

       "d_gethbyname"
	   From d_gethbynm.U:

	   This variable conditionally defines the "HAS_GETHOSTBYNAME" symbol, which indicates to
	   the C program that the gethostbyname() routine is available to look up host names in
	   some data base or other.

       "d_gethent"
	   From d_gethent.U:

	   This variable conditionally defines "HAS_GETHOSTENT" if gethostent() is available to
	   look up host names in some data base or another.

       "d_gethname"
	   From d_gethname.U:

	   This variable conditionally defines the "HAS_GETHOSTNAME" symbol, which indicates to
	   the C program that the gethostname() routine may be used to derive the host name.

       "d_gethostbyaddr_r"
	   From d_gethostbyaddr_r.U:

	   This variable conditionally defines the "HAS_GETHOSTBYADDR_R" symbol, which indicates
	   to the C program that the gethostbyaddr_r() routine is available.

       "d_gethostbyname_r"
	   From d_gethostbyname_r.U:

	   This variable conditionally defines the "HAS_GETHOSTBYNAME_R" symbol, which indicates
	   to the C program that the gethostbyname_r() routine is available.

       "d_gethostent_r"
	   From d_gethostent_r.U:

	   This variable conditionally defines the "HAS_GETHOSTENT_R" symbol, which indicates to
	   the C program that the gethostent_r() routine is available.

       "d_gethostprotos"
	   From d_gethostprotos.U:

	   This variable conditionally defines the "HAS_GETHOST_PROTOS" symbol, which indicates
	   to the C program that <netdb.h> supplies prototypes for the various gethost*() func-
	   tions.  See also netdbtype.U for probing for various netdb types.

       "d_getitimer"
	   From d_getitimer.U:

	   This variable conditionally defines the "HAS_GETITIMER" symbol, which indicates to the
	   C program that the getitimer() routine is available.

       "d_getlogin"
	   From d_getlogin.U:

	   This variable conditionally defines the "HAS_GETLOGIN" symbol, which indicates to the
	   C program that the getlogin() routine is available to get the login name.

       "d_getlogin_r"
	   From d_getlogin_r.U:

	   This variable conditionally defines the "HAS_GETLOGIN_R" symbol, which indicates to
	   the C program that the getlogin_r() routine is available.

       "d_getmnt"
	   From d_getmnt.U:

	   This variable conditionally defines the "HAS_GETMNT" symbol, which indicates to the C
	   program that the getmnt() routine is available to retrieve one or more mount info
	   blocks by filename.

       "d_getmntent"
	   From d_getmntent.U:

	   This variable conditionally defines the "HAS_GETMNTENT" symbol, which indicates to the
	   C program that the getmntent() routine is available to iterate through mounted files
	   to get their mount info.

       "d_getnbyaddr"
	   From d_getnbyad.U:

	   This variable conditionally defines the "HAS_GETNETBYADDR" symbol, which indicates to
	   the C program that the getnetbyaddr() routine is available to look up networks by
	   their "IP" addresses.

       "d_getnbyname"
	   From d_getnbynm.U:

	   This variable conditionally defines the "HAS_GETNETBYNAME" symbol, which indicates to
	   the C program that the getnetbyname() routine is available to look up networks by
	   their names.

       "d_getnent"
	   From d_getnent.U:

	   This variable conditionally defines "HAS_GETNETENT" if getnetent() is available to
	   look up network names in some data base or another.

       "d_getnetbyaddr_r"
	   From d_getnetbyaddr_r.U:

	   This variable conditionally defines the "HAS_GETNETBYADDR_R" symbol, which indicates
	   to the C program that the getnetbyaddr_r() routine is available.

       "d_getnetbyname_r"
	   From d_getnetbyname_r.U:

	   This variable conditionally defines the "HAS_GETNETBYNAME_R" symbol, which indicates
	   to the C program that the getnetbyname_r() routine is available.

       "d_getnetent_r"
	   From d_getnetent_r.U:

	   This variable conditionally defines the "HAS_GETNETENT_R" symbol, which indicates to
	   the C program that the getnetent_r() routine is available.

       "d_getnetprotos"
	   From d_getnetprotos.U:

	   This variable conditionally defines the "HAS_GETNET_PROTOS" symbol, which indicates to
	   the C program that <netdb.h> supplies prototypes for the various getnet*() functions.
	   See also netdbtype.U for probing for various netdb types.

       "d_getpagsz"
	   From d_getpagsz.U:

	   This variable conditionally defines "HAS_GETPAGESIZE" if getpagesize() is available to
	   get the system page size.

       "d_getpbyname"
	   From d_getprotby.U:

	   This variable conditionally defines the "HAS_GETPROTOBYNAME" symbol, which indicates
	   to the C program that the getprotobyname() routine is available to look up protocols
	   by their name.

       "d_getpbynumber"
	   From d_getprotby.U:

	   This variable conditionally defines the "HAS_GETPROTOBYNUMBER" symbol, which indicates
	   to the C program that the getprotobynumber() routine is available to look up protocols
	   by their number.

       "d_getpent"
	   From d_getpent.U:

	   This variable conditionally defines "HAS_GETPROTOENT" if getprotoent() is available to
	   look up protocols in some data base or another.

       "d_getpgid"
	   From d_getpgid.U:

	   This variable conditionally defines the "HAS_GETPGID" symbol, which indicates to the C
	   program that the getpgid(pid) function is available to get the process group id.

       "d_getpgrp2"
	   From d_getpgrp2.U:

	   This variable conditionally defines the HAS_GETPGRP2 symbol, which indicates to the C
	   program that the getpgrp2() (as in DG/"UX") routine is available to get the current
	   process group.

       "d_getpgrp"
	   From d_getpgrp.U:

	   This variable conditionally defines "HAS_GETPGRP" if getpgrp() is available to get the
	   current process group.

       "d_getppid"
	   From d_getppid.U:

	   This variable conditionally defines the "HAS_GETPPID" symbol, which indicates to the C
	   program that the getppid() routine is available to get the parent process "ID".

       "d_getprior"
	   From d_getprior.U:

	   This variable conditionally defines "HAS_GETPRIORITY" if getpriority() is available to
	   get a process's priority.

       "d_getprotobyname_r"
	   From d_getprotobyname_r.U:

	   This variable conditionally defines the "HAS_GETPROTOBYNAME_R" symbol, which indicates
	   to the C program that the getprotobyname_r() routine is available.

       "d_getprotobynumber_r"
	   From d_getprotobynumber_r.U:

	   This variable conditionally defines the "HAS_GETPROTOBYNUMBER_R" symbol, which indi-
	   cates to the C program that the getprotobynumber_r() routine is available.

       "d_getprotoent_r"
	   From d_getprotoent_r.U:

	   This variable conditionally defines the "HAS_GETPROTOENT_R" symbol, which indicates to
	   the C program that the getprotoent_r() routine is available.

       "d_getprotoprotos"
	   From d_getprotoprotos.U:

	   This variable conditionally defines the "HAS_GETPROTO_PROTOS" symbol, which indicates
	   to the C program that <netdb.h> supplies prototypes for the various getproto*() func-
	   tions.  See also netdbtype.U for probing for various netdb types.

       "d_getprpwnam"
	   From d_getprpwnam.U:

	   This variable conditionally defines "HAS_GETPRPWNAM" if getprpwnam() is available to
	   retrieve protected (shadow) password entries by name.

       "d_getpwent"
	   From d_getpwent.U:

	   This variable conditionally defines the "HAS_GETPWENT" symbol, which indicates to the
	   C program that the getpwent() routine is available for sequential access of the passwd
	   database.

       "d_getpwent_r"
	   From d_getpwent_r.U:

	   This variable conditionally defines the "HAS_GETPWENT_R" symbol, which indicates to
	   the C program that the getpwent_r() routine is available.

       "d_getpwnam_r"
	   From d_getpwnam_r.U:

	   This variable conditionally defines the "HAS_GETPWNAM_R" symbol, which indicates to
	   the C program that the getpwnam_r() routine is available.

       "d_getpwuid_r"
	   From d_getpwuid_r.U:

	   This variable conditionally defines the "HAS_GETPWUID_R" symbol, which indicates to
	   the C program that the getpwuid_r() routine is available.

       "d_getsbyname"
	   From d_getsrvby.U:

	   This variable conditionally defines the "HAS_GETSERVBYNAME" symbol, which indicates to
	   the C program that the getservbyname() routine is available to look up services by
	   their name.

       "d_getsbyport"
	   From d_getsrvby.U:

	   This variable conditionally defines the "HAS_GETSERVBYPORT" symbol, which indicates to
	   the C program that the getservbyport() routine is available to look up services by
	   their port.

       "d_getsent"
	   From d_getsent.U:

	   This variable conditionally defines "HAS_GETSERVENT" if getservent() is available to
	   look up network services in some data base or another.

       "d_getservbyname_r"
	   From d_getservbyname_r.U:

	   This variable conditionally defines the "HAS_GETSERVBYNAME_R" symbol, which indicates
	   to the C program that the getservbyname_r() routine is available.

       "d_getservbyport_r"
	   From d_getservbyport_r.U:

	   This variable conditionally defines the "HAS_GETSERVBYPORT_R" symbol, which indicates
	   to the C program that the getservbyport_r() routine is available.

       "d_getservent_r"
	   From d_getservent_r.U:

	   This variable conditionally defines the "HAS_GETSERVENT_R" symbol, which indicates to
	   the C program that the getservent_r() routine is available.

       "d_getservprotos"
	   From d_getservprotos.U:

	   This variable conditionally defines the "HAS_GETSERV_PROTOS" symbol, which indicates
	   to the C program that <netdb.h> supplies prototypes for the various getserv*() func-
	   tions.  See also netdbtype.U for probing for various netdb types.

       "d_getspnam"
	   From d_getspnam.U:

	   This variable conditionally defines "HAS_GETSPNAM" if getspnam() is available to
	   retrieve SysV shadow password entries by name.

       "d_getspnam_r"
	   From d_getspnam_r.U:

	   This variable conditionally defines the "HAS_GETSPNAM_R" symbol, which indicates to
	   the C program that the getspnam_r() routine is available.

       "d_gettimeod"
	   From d_ftime.U:

	   This variable conditionally defines the "HAS_GETTIMEOFDAY" symbol, which indicates
	   that the gettimeofday() system call exists (to obtain a sub-second accuracy clock).
	   You should probably include <sys/resource.h>.

       "d_gmtime_r"
	   From d_gmtime_r.U:

	   This variable conditionally defines the "HAS_GMTIME_R" symbol, which indicates to the
	   C program that the gmtime_r() routine is available.

       "d_gnulibc"
	   From d_gnulibc.U:

	   Defined if we're dealing with the "GNU" C Library.

       "d_grpasswd"
	   From i_grp.U:

	   This variable conditionally defines "GRPASSWD", which indicates that struct group in
	   <grp.h> contains gr_passwd.

       "d_hasmntopt"
	   From d_hasmntopt.U:

	   This variable conditionally defines the "HAS_HASMNTOPT" symbol, which indicates to the
	   C program that the hasmntopt() routine is available to query the mount options of file
	   systems.

       "d_htonl"
	   From d_htonl.U:

	   This variable conditionally defines "HAS_HTONL" if htonl() and its friends are avail-
	   able to do network order byte swapping.

       "d_index"
	   From d_strchr.U:

	   This variable conditionally defines "HAS_INDEX" if index() and rindex() are available
	   for string searching.

       "d_inetaton"
	   From d_inetaton.U:

	   This variable conditionally defines the "HAS_INET_ATON" symbol, which indicates to the
	   C program that the inet_aton() function is available to parse "IP" address "dot-
	   ted-quad" strings.

       "d_int64_t"
	   From d_int64_t.U:

	   This symbol will be defined if the C compiler supports int64_t.

       "d_isascii"
	   From d_isascii.U:

	   This variable conditionally defines the "HAS_ISASCII" constant, which indicates to the
	   C program that isascii() is available.

       "d_isfinite"
	   From d_isfinite.U:

	   This variable conditionally defines the "HAS_ISFINITE" symbol, which indicates to the
	   C program that the isfinite() routine is available.

       "d_isinf"
	   From d_isinf.U:

	   This variable conditionally defines the "HAS_ISINF" symbol, which indicates to the C
	   program that the isinf() routine is available.

       "d_isnan"
	   From d_isnan.U:

	   This variable conditionally defines the "HAS_ISNAN" symbol, which indicates to the C
	   program that the isnan() routine is available.

       "d_isnanl"
	   From d_isnanl.U:

	   This variable conditionally defines the "HAS_ISNANL" symbol, which indicates to the C
	   program that the isnanl() routine is available.

       "d_killpg"
	   From d_killpg.U:

	   This variable conditionally defines the "HAS_KILLPG" symbol, which indicates to the C
	   program that the killpg() routine is available to kill process groups.

       "d_lchown"
	   From d_lchown.U:

	   This variable conditionally defines the "HAS_LCHOWN" symbol, which indicates to the C
	   program that the lchown() routine is available to operate on a symbolic link (instead
	   of following the link).

       "d_ldbl_dig"
	   From d_ldbl_dig.U:

	   This variable conditionally defines d_ldbl_dig if this system's header files provide
	   "LDBL_DIG", which is the number of significant digits in a long double precision num-
	   ber.

       "d_link"
	   From d_link.U:

	   This variable conditionally defines "HAS_LINK" if link() is available to create hard
	   links.

       "d_localtime_r"
	   From d_localtime_r.U:

	   This variable conditionally defines the "HAS_LOCALTIME_R" symbol, which indicates to
	   the C program that the localtime_r() routine is available.

       "d_locconv"
	   From d_locconv.U:

	   This variable conditionally defines "HAS_LOCALECONV" if localeconv() is available for
	   numeric and monetary formatting conventions.

       "d_lockf"
	   From d_lockf.U:

	   This variable conditionally defines "HAS_LOCKF" if lockf() is available to do file
	   locking.

       "d_longdbl"
	   From d_longdbl.U:

	   This variable conditionally defines "HAS_LONG_DOUBLE" if the long double type is sup-
	   ported.

       "d_longlong"
	   From d_longlong.U:

	   This variable conditionally defines "HAS_LONG_LONG" if the long long type is sup-
	   ported.

       "d_lseekproto"
	   From d_lseekproto.U:

	   This variable conditionally defines the "HAS_LSEEK_PROTO" symbol, which indicates to
	   the C program that the system provides a prototype for the lseek() function.  Other-
	   wise, it is up to the program to supply one.

       "d_lstat"
	   From d_lstat.U:

	   This variable conditionally defines "HAS_LSTAT" if lstat() is available to do file
	   stats on symbolic links.

       "d_madvise"
	   From d_madvise.U:

	   This variable conditionally defines "HAS_MADVISE" if madvise() is available to map a
	   file into memory.

       "d_mblen"
	   From d_mblen.U:

	   This variable conditionally defines the "HAS_MBLEN" symbol, which indicates to the C
	   program that the mblen() routine is available to find the number of bytes in a multi-
	   bye character.

       "d_mbstowcs"
	   From d_mbstowcs.U:

	   This variable conditionally defines the "HAS_MBSTOWCS" symbol, which indicates to the
	   C program that the mbstowcs() routine is available to convert a multibyte string into
	   a wide character string.

       "d_mbtowc"
	   From d_mbtowc.U:

	   This variable conditionally defines the "HAS_MBTOWC" symbol, which indicates to the C
	   program that the mbtowc() routine is available to convert multibyte to a wide charac-
	   ter.

       "d_memchr"
	   From d_memchr.U:

	   This variable conditionally defines the "HAS_MEMCHR" symbol, which indicates to the C
	   program that the memchr() routine is available to locate characters within a C string.

       "d_memcmp"
	   From d_memcmp.U:

	   This variable conditionally defines the "HAS_MEMCMP" symbol, which indicates to the C
	   program that the memcmp() routine is available to compare blocks of memory.

       "d_memcpy"
	   From d_memcpy.U:

	   This variable conditionally defines the "HAS_MEMCPY" symbol, which indicates to the C
	   program that the memcpy() routine is available to copy blocks of memory.

       "d_memmove"
	   From d_memmove.U:

	   This variable conditionally defines the "HAS_MEMMOVE" symbol, which indicates to the C
	   program that the memmove() routine is available to copy potentatially overlapping
	   blocks of memory.

       "d_memset"
	   From d_memset.U:

	   This variable conditionally defines the "HAS_MEMSET" symbol, which indicates to the C
	   program that the memset() routine is available to set blocks of memory.

       "d_mkdir"
	   From d_mkdir.U:

	   This variable conditionally defines the "HAS_MKDIR" symbol, which indicates to the C
	   program that the mkdir() routine is available to create directories..

       "d_mkdtemp"
	   From d_mkdtemp.U:

	   This variable conditionally defines the "HAS_MKDTEMP" symbol, which indicates to the C
	   program that the mkdtemp() routine is available to exclusively create a uniquely named
	   temporary directory.

       "d_mkfifo"
	   From d_mkfifo.U:

	   This variable conditionally defines the "HAS_MKFIFO" symbol, which indicates to the C
	   program that the mkfifo() routine is available.

       "d_mkstemp"
	   From d_mkstemp.U:

	   This variable conditionally defines the "HAS_MKSTEMP" symbol, which indicates to the C
	   program that the mkstemp() routine is available to exclusively create and open a
	   uniquely named temporary file.

       "d_mkstemps"
	   From d_mkstemps.U:

	   This variable conditionally defines the "HAS_MKSTEMPS" symbol, which indicates to the
	   C program that the mkstemps() routine is available to exclusively create and open a
	   uniquely named (with a suffix) temporary file.

       "d_mktime"
	   From d_mktime.U:

	   This variable conditionally defines the "HAS_MKTIME" symbol, which indicates to the C
	   program that the mktime() routine is available.

       "d_mmap"
	   From d_mmap.U:

	   This variable conditionally defines "HAS_MMAP" if mmap() is available to map a file
	   into memory.

       "d_modfl"
	   From d_modfl.U:

	   This variable conditionally defines the "HAS_MODFL" symbol, which indicates to the C
	   program that the modfl() routine is available.

       "d_modfl_pow32_bug"
	   From d_modfl.U:

	   This variable conditionally defines the HAS_MODFL_POW32_BUG symbol, which indicates
	   that modfl() is broken for long doubles >= pow(2, 32).  For example from
	   4294967303.150000 one would get 4294967302.000000 and 1.150000.  The bug has been seen
	   in certain versions of glibc, release 2.2.2 is known to be okay.

       "d_modflproto"
	   From d_modfl.U:

	   This symbol, if defined, indicates that the system provides a prototype for the
	   modfl() function.  Otherwise, it is up to the program to supply one.  C99 says it
	   should be long double modfl(long double, long double *);

       "d_mprotect"
	   From d_mprotect.U:

	   This variable conditionally defines "HAS_MPROTECT" if mprotect() is available to mod-
	   ify the access protection of a memory mapped file.

       "d_msg"
	   From d_msg.U:

	   This variable conditionally defines the "HAS_MSG" symbol, which indicates that the
	   entire msg*(2) library is present.

       "d_msg_ctrunc"
	   From d_socket.U:

	   This variable conditionally defines the "HAS_MSG_CTRUNC" symbol, which indicates that
	   the "MSG_CTRUNC" is available.  #ifdef is not enough because it may be an enum, glibc
	   has been known to do this.

       "d_msg_dontroute"
	   From d_socket.U:

	   This variable conditionally defines the "HAS_MSG_DONTROUTE" symbol, which indicates
	   that the "MSG_DONTROUTE" is available.  #ifdef is not enough because it may be an
	   enum, glibc has been known to do this.

       "d_msg_oob"
	   From d_socket.U:

	   This variable conditionally defines the "HAS_MSG_OOB" symbol, which indicates that the
	   "MSG_OOB" is available.  #ifdef is not enough because it may be an enum, glibc has
	   been known to do this.

       "d_msg_peek"
	   From d_socket.U:

	   This variable conditionally defines the "HAS_MSG_PEEK" symbol, which indicates that
	   the "MSG_PEEK" is available.  #ifdef is not enough because it may be an enum, glibc
	   has been known to do this.

       "d_msg_proxy"
	   From d_socket.U:

	   This variable conditionally defines the "HAS_MSG_PROXY" symbol, which indicates that
	   the "MSG_PROXY" is available.  #ifdef is not enough because it may be an enum, glibc
	   has been known to do this.

       "d_msgctl"
	   From d_msgctl.U:

	   This variable conditionally defines the "HAS_MSGCTL" symbol, which indicates to the C
	   program that the msgctl() routine is available.

       "d_msgget"
	   From d_msgget.U:

	   This variable conditionally defines the "HAS_MSGGET" symbol, which indicates to the C
	   program that the msgget() routine is available.

       "d_msghdr_s"
	   From d_msghdr_s.U:

	   This variable conditionally defines the "HAS_STRUCT_MSGHDR" symbol, which indicates
	   that the struct msghdr is supported.

       "d_msgrcv"
	   From d_msgrcv.U:

	   This variable conditionally defines the "HAS_MSGRCV" symbol, which indicates to the C
	   program that the msgrcv() routine is available.

       "d_msgsnd"
	   From d_msgsnd.U:

	   This variable conditionally defines the "HAS_MSGSND" symbol, which indicates to the C
	   program that the msgsnd() routine is available.

       "d_msync"
	   From d_msync.U:

	   This variable conditionally defines "HAS_MSYNC" if msync() is available to synchronize
	   a mapped file.

       "d_munmap"
	   From d_munmap.U:

	   This variable conditionally defines "HAS_MUNMAP" if munmap() is available to unmap a
	   region mapped by mmap().

       "d_mymalloc"
	   From mallocsrc.U:

	   This variable conditionally defines "MYMALLOC" in case other parts of the source want
	   to take special action if "MYMALLOC" is used.  This may include different sorts of
	   profiling or error detection.

       "d_nanosleep"
	   From d_nanosleep.U:

	   This variable conditionally defines "HAS_NANOSLEEP" if nanosleep() is available to
	   sleep with 1E-9 sec accuracy.

       "d_nice"
	   From d_nice.U:

	   This variable conditionally defines the "HAS_NICE" symbol, which indicates to the C
	   program that the nice() routine is available.

       "d_nl_langinfo"
	   From d_nl_langinfo.U:

	   This variable conditionally defines the "HAS_NL_LANGINFO" symbol, which indicates to
	   the C program that the nl_langinfo() routine is available.

       "d_nv_preserves_uv"
	   From perlxv.U:

	   This variable indicates whether a variable of type nvtype can preserve all the bits a
	   variable of type uvtype.

       "d_off64_t"
	   From d_off64_t.U:

	   This symbol will be defined if the C compiler supports off64_t.

       "d_old_pthread_create_joinable"
	   From d_pthrattrj.U:

	   This variable conditionally defines pthread_create_joinable.  undef if pthread.h
	   defines "PTHREAD_CREATE_JOINABLE".

       "d_oldpthreads"
	   From usethreads.U:

	   This variable conditionally defines the "OLD_PTHREADS_API" symbol, and indicates that
	   Perl should be built to use the old draft "POSIX" threads "API".  This is only poten-
	   tially meaningful if usethreads is set.

       "d_oldsock"
	   From d_socket.U:

	   This variable conditionally defines the "OLDSOCKET" symbol, which indicates that the
	   "BSD" socket interface is based on 4.1c and not 4.2.

       "d_open3"
	   From d_open3.U:

	   This variable conditionally defines the HAS_OPEN3 manifest constant, which indicates
	   to the C program that the 3 argument version of the open(2) function is available.

       "d_pathconf"
	   From d_pathconf.U:

	   This variable conditionally defines the "HAS_PATHCONF" symbol, which indicates to the
	   C program that the pathconf() routine is available to determine file-system related
	   limits and options associated with a given filename.

       "d_pause"
	   From d_pause.U:

	   This variable conditionally defines the "HAS_PAUSE" symbol, which indicates to the C
	   program that the pause() routine is available to suspend a process until a signal is
	   received.

       "d_perl_otherlibdirs"
	   From otherlibdirs.U:

	   This variable conditionally defines "PERL_OTHERLIBDIRS", which contains a colon-sepa-
	   rated set of paths for the perl binary to include in @"INC".  See also otherlibdirs.

       "d_phostname"
	   From d_gethname.U:

	   This variable conditionally defines the "HAS_PHOSTNAME" symbol, which contains the
	   shell command which, when fed to popen(), may be used to derive the host name.

       "d_pipe"
	   From d_pipe.U:

	   This variable conditionally defines the "HAS_PIPE" symbol, which indicates to the C
	   program that the pipe() routine is available to create an inter-process channel.

       "d_poll"
	   From d_poll.U:

	   This variable conditionally defines the "HAS_POLL" symbol, which indicates to the C
	   program that the poll() routine is available to poll active file descriptors.

       "d_portable"
	   From d_portable.U:

	   This variable conditionally defines the "PORTABLE" symbol, which indicates to the C
	   program that it should not assume that it is running on the machine it was compiled
	   on.

       "d_procselfexe"
	   From d_procselfexe.U:

	   Defined if $procselfexe is symlink to the absolute pathname of the executing program.

       "d_pthread_atfork"
	   From d_pthread_atfork.U:

	   This variable conditionally defines the "HAS_PTHREAD_ATFORK" symbol, which indicates
	   to the C program that the pthread_atfork() routine is available.

       "d_pthread_yield"
	   From d_pthread_y.U:

	   This variable conditionally defines the "HAS_PTHREAD_YIELD" symbol if the
	   pthread_yield routine is available to yield the execution of the current thread.

       "d_pwage"
	   From i_pwd.U:

	   This variable conditionally defines "PWAGE", which indicates that struct passwd con-
	   tains pw_age.

       "d_pwchange"
	   From i_pwd.U:

	   This variable conditionally defines "PWCHANGE", which indicates that struct passwd
	   contains pw_change.

       "d_pwclass"
	   From i_pwd.U:

	   This variable conditionally defines "PWCLASS", which indicates that struct passwd con-
	   tains pw_class.

       "d_pwcomment"
	   From i_pwd.U:

	   This variable conditionally defines "PWCOMMENT", which indicates that struct passwd
	   contains pw_comment.

       "d_pwexpire"
	   From i_pwd.U:

	   This variable conditionally defines "PWEXPIRE", which indicates that struct passwd
	   contains pw_expire.

       "d_pwgecos"
	   From i_pwd.U:

	   This variable conditionally defines "PWGECOS", which indicates that struct passwd con-
	   tains pw_gecos.

       "d_pwpasswd"
	   From i_pwd.U:

	   This variable conditionally defines "PWPASSWD", which indicates that struct passwd
	   contains pw_passwd.

       "d_pwquota"
	   From i_pwd.U:

	   This variable conditionally defines "PWQUOTA", which indicates that struct passwd con-
	   tains pw_quota.

       "d_qgcvt"
	   From d_qgcvt.U:

	   This variable conditionally defines the "HAS_QGCVT" symbol, which indicates to the C
	   program that the qgcvt() routine is available.

       "d_quad"
	   From quadtype.U:

	   This variable, if defined, tells that there's a 64-bit integer type, quadtype.

       "d_random_r"
	   From d_random_r.U:

	   This variable conditionally defines the "HAS_RANDOM_R" symbol, which indicates to the
	   C program that the random_r() routine is available.

       "d_readdir64_r"
	   From d_readdir64_r.U:

	   This variable conditionally defines the HAS_READDIR64_R symbol, which indicates to the
	   C program that the readdir64_r() routine is available.

       "d_readdir"
	   From d_readdir.U:

	   This variable conditionally defines "HAS_READDIR" if readdir() is available to read
	   directory entries.

       "d_readdir_r"
	   From d_readdir_r.U:

	   This variable conditionally defines the "HAS_READDIR_R" symbol, which indicates to the
	   C program that the readdir_r() routine is available.

       "d_readlink"
	   From d_readlink.U:

	   This variable conditionally defines the "HAS_READLINK" symbol, which indicates to the
	   C program that the readlink() routine is available to read the value of a symbolic
	   link.

       "d_readv"
	   From d_readv.U:

	   This variable conditionally defines the "HAS_READV" symbol, which indicates to the C
	   program that the readv() routine is available.

       "d_recvmsg"
	   From d_recvmsg.U:

	   This variable conditionally defines the "HAS_RECVMSG" symbol, which indicates to the C
	   program that the recvmsg() routine is available.

       "d_rename"
	   From d_rename.U:

	   This variable conditionally defines the "HAS_RENAME" symbol, which indicates to the C
	   program that the rename() routine is available to rename files.

       "d_rewinddir"
	   From d_readdir.U:

	   This variable conditionally defines "HAS_REWINDDIR" if rewinddir() is available.

       "d_rmdir"
	   From d_rmdir.U:

	   This variable conditionally defines "HAS_RMDIR" if rmdir() is available to remove
	   directories.

       "d_safebcpy"
	   From d_safebcpy.U:

	   This variable conditionally defines the "HAS_SAFE_BCOPY" symbol if the bcopy() routine
	   can do overlapping copies.  Normally, you should probably use memmove().

       "d_safemcpy"
	   From d_safemcpy.U:

	   This variable conditionally defines the "HAS_SAFE_MEMCPY" symbol if the memcpy() rou-
	   tine can do overlapping copies.  For overlapping copies, memmove() should be used, if
	   available.

       "d_sanemcmp"
	   From d_sanemcmp.U:

	   This variable conditionally defines the "HAS_SANE_MEMCMP" symbol if the memcpy() rou-
	   tine is available and can be used to compare relative magnitudes of chars with their
	   high bits set.

       "d_sbrkproto"
	   From d_sbrkproto.U:

	   This variable conditionally defines the "HAS_SBRK_PROTO" symbol, which indicates to
	   the C program that the system provides a prototype for the sbrk() function.	Other-
	   wise, it is up to the program to supply one.

       "d_sched_yield"
	   From d_pthread_y.U:

	   This variable conditionally defines the "HAS_SCHED_YIELD" symbol if the sched_yield
	   routine is available to yield the execution of the current thread.

       "d_scm_rights"
	   From d_socket.U:

	   This variable conditionally defines the "HAS_SCM_RIGHTS" symbol, which indicates that
	   the "SCM_RIGHTS" is available.  #ifdef is not enough because it may be an enum, glibc
	   has been known to do this.

       "d_seekdir"
	   From d_readdir.U:

	   This variable conditionally defines "HAS_SEEKDIR" if seekdir() is available.

       "d_select"
	   From d_select.U:

	   This variable conditionally defines "HAS_SELECT" if select() is available to select
	   active file descriptors. A <sys/time.h> inclusion may be necessary for the timeout
	   field.

       "d_sem"
	   From d_sem.U:

	   This variable conditionally defines the "HAS_SEM" symbol, which indicates that the
	   entire sem*(2) library is present.

       "d_semctl"
	   From d_semctl.U:

	   This variable conditionally defines the "HAS_SEMCTL" symbol, which indicates to the C
	   program that the semctl() routine is available.

       "d_semctl_semid_ds"
	   From d_union_semun.U:

	   This variable conditionally defines "USE_SEMCTL_SEMID_DS", which indicates that struct
	   semid_ds * is to be used for semctl "IPC_STAT".

       "d_semctl_semun"
	   From d_union_semun.U:

	   This variable conditionally defines "USE_SEMCTL_SEMUN", which indicates that union
	   semun is to be used for semctl "IPC_STAT".

       "d_semget"
	   From d_semget.U:

	   This variable conditionally defines the "HAS_SEMGET" symbol, which indicates to the C
	   program that the semget() routine is available.

       "d_semop"
	   From d_semop.U:

	   This variable conditionally defines the "HAS_SEMOP" symbol, which indicates to the C
	   program that the semop() routine is available.

       "d_sendmsg"
	   From d_sendmsg.U:

	   This variable conditionally defines the "HAS_SENDMSG" symbol, which indicates to the C
	   program that the sendmsg() routine is available.

       "d_setegid"
	   From d_setegid.U:

	   This variable conditionally defines the "HAS_SETEGID" symbol, which indicates to the C
	   program that the setegid() routine is available to change the effective gid of the
	   current program.

       "d_seteuid"
	   From d_seteuid.U:

	   This variable conditionally defines the "HAS_SETEUID" symbol, which indicates to the C
	   program that the seteuid() routine is available to change the effective uid of the
	   current program.

       "d_setgrent"
	   From d_setgrent.U:

	   This variable conditionally defines the "HAS_SETGRENT" symbol, which indicates to the
	   C program that the setgrent() routine is available for initializing sequential access
	   to the group database.

       "d_setgrent_r"
	   From d_setgrent_r.U:

	   This variable conditionally defines the "HAS_SETGRENT_R" symbol, which indicates to
	   the C program that the setgrent_r() routine is available.

       "d_setgrps"
	   From d_setgrps.U:

	   This variable conditionally defines the "HAS_SETGROUPS" symbol, which indicates to the
	   C program that the setgroups() routine is available to set the list of process groups.

       "d_sethent"
	   From d_sethent.U:

	   This variable conditionally defines "HAS_SETHOSTENT" if sethostent() is available.

       "d_sethostent_r"
	   From d_sethostent_r.U:

	   This variable conditionally defines the "HAS_SETHOSTENT_R" symbol, which indicates to
	   the C program that the sethostent_r() routine is available.

       "d_setitimer"
	   From d_setitimer.U:

	   This variable conditionally defines the "HAS_SETITIMER" symbol, which indicates to the
	   C program that the setitimer() routine is available.

       "d_setlinebuf"
	   From d_setlnbuf.U:

	   This variable conditionally defines the "HAS_SETLINEBUF" symbol, which indicates to
	   the C program that the setlinebuf() routine is available to change stderr or stdout
	   from block-buffered or unbuffered to a line-buffered mode.

       "d_setlocale"
	   From d_setlocale.U:

	   This variable conditionally defines "HAS_SETLOCALE" if setlocale() is available to
	   handle locale-specific ctype implementations.

       "d_setlocale_r"
	   From d_setlocale_r.U:

	   This variable conditionally defines the "HAS_SETLOCALE_R" symbol, which indicates to
	   the C program that the setlocale_r() routine is available.

       "d_setnent"
	   From d_setnent.U:

	   This variable conditionally defines "HAS_SETNETENT" if setnetent() is available.

       "d_setnetent_r"
	   From d_setnetent_r.U:

	   This variable conditionally defines the "HAS_SETNETENT_R" symbol, which indicates to
	   the C program that the setnetent_r() routine is available.

       "d_setpent"
	   From d_setpent.U:

	   This variable conditionally defines "HAS_SETPROTOENT" if setprotoent() is available.

       "d_setpgid"
	   From d_setpgid.U:

	   This variable conditionally defines the "HAS_SETPGID" symbol if the setpgid(pid, gpid)
	   function is available to set process group "ID".

       "d_setpgrp2"
	   From d_setpgrp2.U:

	   This variable conditionally defines the HAS_SETPGRP2 symbol, which indicates to the C
	   program that the setpgrp2() (as in DG/"UX") routine is available to set the current
	   process group.

       "d_setpgrp"
	   From d_setpgrp.U:

	   This variable conditionally defines "HAS_SETPGRP" if setpgrp() is available to set the
	   current process group.

       "d_setprior"
	   From d_setprior.U:

	   This variable conditionally defines "HAS_SETPRIORITY" if setpriority() is available to
	   set a process's priority.

       "d_setproctitle"
	   From d_setproctitle.U:

	   This variable conditionally defines the "HAS_SETPROCTITLE" symbol, which indicates to
	   the C program that the setproctitle() routine is available.

       "d_setprotoent_r"
	   From d_setprotoent_r.U:

	   This variable conditionally defines the "HAS_SETPROTOENT_R" symbol, which indicates to
	   the C program that the setprotoent_r() routine is available.

       "d_setpwent"
	   From d_setpwent.U:

	   This variable conditionally defines the "HAS_SETPWENT" symbol, which indicates to the
	   C program that the setpwent() routine is available for initializing sequential access
	   to the passwd database.

       "d_setpwent_r"
	   From d_setpwent_r.U:

	   This variable conditionally defines the "HAS_SETPWENT_R" symbol, which indicates to
	   the C program that the setpwent_r() routine is available.

       "d_setregid"
	   From d_setregid.U:

	   This variable conditionally defines "HAS_SETREGID" if setregid() is available to
	   change the real and effective gid of the current process.

       "d_setresgid"
	   From d_setregid.U:

	   This variable conditionally defines "HAS_SETRESGID" if setresgid() is available to
	   change the real, effective and saved gid of the current process.

       "d_setresuid"
	   From d_setreuid.U:

	   This variable conditionally defines "HAS_SETREUID" if setresuid() is available to
	   change the real, effective and saved uid of the current process.

       "d_setreuid"
	   From d_setreuid.U:

	   This variable conditionally defines "HAS_SETREUID" if setreuid() is available to
	   change the real and effective uid of the current process.

       "d_setrgid"
	   From d_setrgid.U:

	   This variable conditionally defines the "HAS_SETRGID" symbol, which indicates to the C
	   program that the setrgid() routine is available to change the real gid of the current
	   program.

       "d_setruid"
	   From d_setruid.U:

	   This variable conditionally defines the "HAS_SETRUID" symbol, which indicates to the C
	   program that the setruid() routine is available to change the real uid of the current
	   program.

       "d_setsent"
	   From d_setsent.U:

	   This variable conditionally defines "HAS_SETSERVENT" if setservent() is available.

       "d_setservent_r"
	   From d_setservent_r.U:

	   This variable conditionally defines the "HAS_SETSERVENT_R" symbol, which indicates to
	   the C program that the setservent_r() routine is available.

       "d_setsid"
	   From d_setsid.U:

	   This variable conditionally defines "HAS_SETSID" if setsid() is available to set the
	   process group "ID".

       "d_setvbuf"
	   From d_setvbuf.U:

	   This variable conditionally defines the "HAS_SETVBUF" symbol, which indicates to the C
	   program that the setvbuf() routine is available to change buffering on an open stdio
	   stream.

       "d_sfio"
	   From d_sfio.U:

	   This variable conditionally defines the "USE_SFIO" symbol, and indicates whether sfio
	   is available (and should be used).

       "d_shm"
	   From d_shm.U:

	   This variable conditionally defines the "HAS_SHM" symbol, which indicates that the
	   entire shm*(2) library is present.

       "d_shmat"
	   From d_shmat.U:

	   This variable conditionally defines the "HAS_SHMAT" symbol, which indicates to the C
	   program that the shmat() routine is available.

       "d_shmatprototype"
	   From d_shmat.U:

	   This variable conditionally defines the "HAS_SHMAT_PROTOTYPE" symbol, which indicates
	   that sys/shm.h has a prototype for shmat.

       "d_shmctl"
	   From d_shmctl.U:

	   This variable conditionally defines the "HAS_SHMCTL" symbol, which indicates to the C
	   program that the shmctl() routine is available.

       "d_shmdt"
	   From d_shmdt.U:

	   This variable conditionally defines the "HAS_SHMDT" symbol, which indicates to the C
	   program that the shmdt() routine is available.

       "d_shmget"
	   From d_shmget.U:

	   This variable conditionally defines the "HAS_SHMGET" symbol, which indicates to the C
	   program that the shmget() routine is available.

       "d_sigaction"
	   From d_sigaction.U:

	   This variable conditionally defines the "HAS_SIGACTION" symbol, which indicates that
	   the Vr4 sigaction() routine is available.

       "d_sigprocmask"
	   From d_sigprocmask.U:

	   This variable conditionally defines "HAS_SIGPROCMASK" if sigprocmask() is available to
	   examine or change the signal mask of the calling process.

       "d_sigsetjmp"
	   From d_sigsetjmp.U:

	   This variable conditionally defines the "HAS_SIGSETJMP" symbol, which indicates that
	   the sigsetjmp() routine is available to call setjmp() and optionally save the
	   process's signal mask.

       "d_sockatmark"
	   From d_sockatmark.U:

	   This variable conditionally defines the "HAS_SOCKATMARK" symbol, which indicates to
	   the C program that the sockatmark() routine is available.

       "d_sockatmarkproto"
	   From d_sockatmarkproto.U:

	   This variable conditionally defines the "HAS_SOCKATMARK_PROTO" symbol, which indicates
	   to the C program that the system provides a prototype for the sockatmark() function.
	   Otherwise, it is up to the program to supply one.

       "d_socket"
	   From d_socket.U:

	   This variable conditionally defines "HAS_SOCKET", which indicates that the "BSD"
	   socket interface is supported.

       "d_socklen_t"
	   From d_socklen_t.U:

	   This symbol will be defined if the C compiler supports socklen_t.

       "d_sockpair"
	   From d_socket.U:

	   This variable conditionally defines the "HAS_SOCKETPAIR" symbol, which indicates that
	   the "BSD" socketpair() is supported.

       "d_socks5_init"
	   From d_socks5_init.U:

	   This variable conditionally defines the HAS_SOCKS5_INIT symbol, which indicates to the
	   C program that the socks5_init() routine is available.

       "d_sqrtl"
	   From d_sqrtl.U:

	   This variable conditionally defines the "HAS_SQRTL" symbol, which indicates to the C
	   program that the sqrtl() routine is available.

       "d_srand48_r"
	   From d_srand48_r.U:

	   This variable conditionally defines the HAS_SRAND48_R symbol, which indicates to the C
	   program that the srand48_r() routine is available.

       "d_srandom_r"
	   From d_srandom_r.U:

	   This variable conditionally defines the "HAS_SRANDOM_R" symbol, which indicates to the
	   C program that the srandom_r() routine is available.

       "d_sresgproto"
	   From d_sresgproto.U:

	   This variable conditionally defines the "HAS_SETRESGID_PROTO" symbol, which indicates
	   to the C program that the system provides a prototype for the setresgid() function.
	   Otherwise, it is up to the program to supply one.

       "d_sresuproto"
	   From d_sresuproto.U:

	   This variable conditionally defines the "HAS_SETRESUID_PROTO" symbol, which indicates
	   to the C program that the system provides a prototype for the setresuid() function.
	   Otherwise, it is up to the program to supply one.

       "d_statblks"
	   From d_statblks.U:

	   This variable conditionally defines "USE_STAT_BLOCKS" if this system has a stat struc-
	   ture declaring st_blksize and st_blocks.

       "d_statfs_f_flags"
	   From d_statfs_f_flags.U:

	   This variable conditionally defines the "HAS_STRUCT_STATFS_F_FLAGS" symbol, which
	   indicates to struct statfs from has f_flags member.	This kind of struct statfs is
	   coming from sys/mount.h ("BSD"), not from sys/statfs.h ("SYSV").

       "d_statfs_s"
	   From d_statfs_s.U:

	   This variable conditionally defines the "HAS_STRUCT_STATFS" symbol, which indicates
	   that the struct statfs is supported.

       "d_statvfs"
	   From d_statvfs.U:

	   This variable conditionally defines the "HAS_STATVFS" symbol, which indicates to the C
	   program that the statvfs() routine is available.

       "d_stdio_cnt_lval"
	   From d_stdstdio.U:

	   This variable conditionally defines "STDIO_CNT_LVALUE" if the "FILE_cnt" macro can be
	   used as an lvalue.

       "d_stdio_ptr_lval"
	   From d_stdstdio.U:

	   This variable conditionally defines "STDIO_PTR_LVALUE" if the "FILE_ptr" macro can be
	   used as an lvalue.

       "d_stdio_ptr_lval_nochange_cnt"
	   From d_stdstdio.U:

	   This symbol is defined if using the "FILE_ptr" macro as an lvalue to increase the
	   pointer by n leaves File_cnt(fp) unchanged.

       "d_stdio_ptr_lval_sets_cnt"
	   From d_stdstdio.U:

	   This symbol is defined if using the "FILE_ptr" macro as an lvalue to increase the
	   pointer by n has the side effect of decreasing the value of File_cnt(fp) by n.

       "d_stdio_stream_array"
	   From stdio_streams.U:

	   This variable tells whether there is an array holding the stdio streams.

       "d_stdiobase"
	   From d_stdstdio.U:

	   This variable conditionally defines "USE_STDIO_BASE" if this system has a "FILE"
	   structure declaring a usable _base field (or equivalent) in stdio.h.

       "d_stdstdio"
	   From d_stdstdio.U:

	   This variable conditionally defines "USE_STDIO_PTR" if this system has a "FILE" struc-
	   ture declaring usable _ptr and _cnt fields (or equivalent) in stdio.h.

       "d_strchr"
	   From d_strchr.U:

	   This variable conditionally defines "HAS_STRCHR" if strchr() and strrchr() are avail-
	   able for string searching.

       "d_strcoll"
	   From d_strcoll.U:

	   This variable conditionally defines "HAS_STRCOLL" if strcoll() is available to compare
	   strings using collating information.

       "d_strctcpy"
	   From d_strctcpy.U:

	   This variable conditionally defines the "USE_STRUCT_COPY" symbol, which indicates to
	   the C program that this C compiler knows how to copy structures.

       "d_strerrm"
	   From d_strerror.U:

	   This variable holds what Strerrr is defined as to translate an error code condition
	   into an error message string. It could be "strerror" or a more "complex" macro emulat-
	   ing strrror with sys_errlist[], or the "unknown" string when both strerror and
	   sys_errlist are missing.

       "d_strerror"
	   From d_strerror.U:

	   This variable conditionally defines "HAS_STRERROR" if strerror() is available to
	   translate error numbers to strings.

       "d_strerror_r"
	   From d_strerror_r.U:

	   This variable conditionally defines the "HAS_STRERROR_R" symbol, which indicates to
	   the C program that the strerror_r() routine is available.

       "d_strftime"
	   From d_strftime.U:

	   This variable conditionally defines the "HAS_STRFTIME" symbol, which indicates to the
	   C program that the strftime() routine is available.

       "d_strtod"
	   From d_strtod.U:

	   This variable conditionally defines the "HAS_STRTOD" symbol, which indicates to the C
	   program that the strtod() routine is available to provide better numeric string con-
	   version than atof().

       "d_strtol"
	   From d_strtol.U:

	   This variable conditionally defines the "HAS_STRTOL" symbol, which indicates to the C
	   program that the strtol() routine is available to provide better numeric string con-
	   version than atoi() and friends.

       "d_strtold"
	   From d_strtold.U:

	   This variable conditionally defines the "HAS_STRTOLD" symbol, which indicates to the C
	   program that the strtold() routine is available.

       "d_strtoll"
	   From d_strtoll.U:

	   This variable conditionally defines the "HAS_STRTOLL" symbol, which indicates to the C
	   program that the strtoll() routine is available.

       "d_strtoq"
	   From d_strtoq.U:

	   This variable conditionally defines the "HAS_STRTOQ" symbol, which indicates to the C
	   program that the strtoq() routine is available.

       "d_strtoul"
	   From d_strtoul.U:

	   This variable conditionally defines the "HAS_STRTOUL" symbol, which indicates to the C
	   program that the strtoul() routine is available to provide conversion of strings to
	   unsigned long.

       "d_strtoull"
	   From d_strtoull.U:

	   This variable conditionally defines the "HAS_STRTOULL" symbol, which indicates to the
	   C program that the strtoull() routine is available.

       "d_strtouq"
	   From d_strtouq.U:

	   This variable conditionally defines the "HAS_STRTOUQ" symbol, which indicates to the C
	   program that the strtouq() routine is available.

       "d_strxfrm"
	   From d_strxfrm.U:

	   This variable conditionally defines "HAS_STRXFRM" if strxfrm() is available to trans-
	   form strings.

       "d_suidsafe"
	   From d_dosuid.U:

	   This variable conditionally defines "SETUID_SCRIPTS_ARE_SECURE_NOW" if setuid scripts
	   can be secure.  This test looks in /dev/fd/.

       "d_symlink"
	   From d_symlink.U:

	   This variable conditionally defines the "HAS_SYMLINK" symbol, which indicates to the C
	   program that the symlink() routine is available to create symbolic links.

       "d_syscall"
	   From d_syscall.U:

	   This variable conditionally defines "HAS_SYSCALL" if syscall() is available call arbi-
	   trary system calls.

       "d_syscallproto"
	   From d_syscallproto.U:

	   This variable conditionally defines the "HAS_SYSCALL_PROTO" symbol, which indicates to
	   the C program that the system provides a prototype for the syscall() function.  Other-
	   wise, it is up to the program to supply one.

       "d_sysconf"
	   From d_sysconf.U:

	   This variable conditionally defines the "HAS_SYSCONF" symbol, which indicates to the C
	   program that the sysconf() routine is available to determine system related limits and
	   options.

       "d_sysernlst"
	   From d_strerror.U:

	   This variable conditionally defines "HAS_SYS_ERRNOLIST" if sys_errnolist[] is avail-
	   able to translate error numbers to the symbolic name.

       "d_syserrlst"
	   From d_strerror.U:

	   This variable conditionally defines "HAS_SYS_ERRLIST" if sys_errlist[] is available to
	   translate error numbers to strings.

       "d_system"
	   From d_system.U:

	   This variable conditionally defines "HAS_SYSTEM" if system() is available to issue a
	   shell command.

       "d_tcgetpgrp"
	   From d_tcgtpgrp.U:

	   This variable conditionally defines the "HAS_TCGETPGRP" symbol, which indicates to the
	   C program that the tcgetpgrp() routine is available.  to get foreground process group
	   "ID".

       "d_tcsetpgrp"
	   From d_tcstpgrp.U:

	   This variable conditionally defines the "HAS_TCSETPGRP" symbol, which indicates to the
	   C program that the tcsetpgrp() routine is available to set foreground process group
	   "ID".

       "d_telldir"
	   From d_readdir.U:

	   This variable conditionally defines "HAS_TELLDIR" if telldir() is available.

       "d_telldirproto"
	   From d_telldirproto.U:

	   This variable conditionally defines the "HAS_TELLDIR_PROTO" symbol, which indicates to
	   the C program that the system provides a prototype for the telldir() function.  Other-
	   wise, it is up to the program to supply one.

       "d_time"
	   From d_time.U:

	   This variable conditionally defines the "HAS_TIME" symbol, which indicates that the
	   time() routine exists.  The time() routine is normaly provided on "UNIX" systems.

       "d_times"
	   From d_times.U:

	   This variable conditionally defines the "HAS_TIMES" symbol, which indicates that the
	   times() routine exists.  The times() routine is normaly provided on "UNIX" systems.
	   You may have to include <sys/times.h>.

       "d_tm_tm_gmtoff"
	   From i_time.U:

	   This variable conditionally defines "HAS_TM_TM_GMTOFF", which indicates indicates to
	   the C program that the struct tm has the tm_gmtoff field.

       "d_tm_tm_zone"
	   From i_time.U:

	   This variable conditionally defines "HAS_TM_TM_ZONE", which indicates indicates to the
	   C program that the struct tm has the tm_zone field.

       "d_tmpnam_r"
	   From d_tmpnam_r.U:

	   This variable conditionally defines the "HAS_TMPNAM_R" symbol, which indicates to the
	   C program that the tmpnam_r() routine is available.

       "d_truncate"
	   From d_truncate.U:

	   This variable conditionally defines "HAS_TRUNCATE" if truncate() is available to trun-
	   cate files.

       "d_ttyname_r"
	   From d_ttyname_r.U:

	   This variable conditionally defines the "HAS_TTYNAME_R" symbol, which indicates to the
	   C program that the ttyname_r() routine is available.

       "d_tzname"
	   From d_tzname.U:

	   This variable conditionally defines "HAS_TZNAME" if tzname[] is available to access
	   timezone names.

       "d_u32align"
	   From d_u32align.U:

	   This variable tells whether you must access character data through U32-aligned point-
	   ers.

       "d_ualarm"
	   From d_ualarm.U:

	   This variable conditionally defines the "HAS_UALARM" symbol, which indicates to the C
	   program that the ualarm() routine is available.

       "d_umask"
	   From d_umask.U:

	   This variable conditionally defines the "HAS_UMASK" symbol, which indicates to the C
	   program that the umask() routine is available.  to set and get the value of the file
	   creation mask.

       "d_uname"
	   From d_gethname.U:

	   This variable conditionally defines the "HAS_UNAME" symbol, which indicates to the C
	   program that the uname() routine may be used to derive the host name.

       "d_union_semun"
	   From d_union_semun.U:

	   This variable conditionally defines "HAS_UNION_SEMUN" if the union semun is defined by
	   including <sys/sem.h>.

       "d_unordered"
	   From d_unordered.U:

	   This variable conditionally defines the "HAS_UNORDERED" symbol, which indicates to the
	   C program that the unordered() routine is available.

       "d_usleep"
	   From d_usleep.U:

	   This variable conditionally defines "HAS_USLEEP" if usleep() is available to do high
	   granularity sleeps.

       "d_usleepproto"
	   From d_usleepproto.U:

	   This variable conditionally defines the "HAS_USLEEP_PROTO" symbol, which indicates to
	   the C program that the system provides a prototype for the usleep() function.  Other-
	   wise, it is up to the program to supply one.

       "d_ustat"
	   From d_ustat.U:

	   This variable conditionally defines "HAS_USTAT" if ustat() is available to query file
	   system statistics by dev_t.

       "d_vendorarch"
	   From vendorarch.U:

	   This variable conditionally defined "PERL_VENDORARCH".

       "d_vendorbin"
	   From vendorbin.U:

	   This variable conditionally defines "PERL_VENDORBIN".

       "d_vendorlib"
	   From vendorlib.U:

	   This variable conditionally defines "PERL_VENDORLIB".

       "d_vfork"
	   From d_vfork.U:

	   This variable conditionally defines the "HAS_VFORK" symbol, which indicates the
	   vfork() routine is available.

       "d_void_closedir"
	   From d_closedir.U:

	   This variable conditionally defines "VOID_CLOSEDIR" if closedir() does not return a
	   value.

       "d_voidsig"
	   From d_voidsig.U:

	   This variable conditionally defines "VOIDSIG" if this system declares "void (*sig-
	   nal(...))()" in signal.h.  The old way was to declare it as "int (*signal(...))()".

       "d_voidtty"
	   From i_sysioctl.U:

	   This variable conditionally defines "USE_IOCNOTTY" to indicate that the ioctl() call
	   with "TIOCNOTTY" should be used to void tty association.  Otherwise (on "USG" proba-
	   bly), it is enough to close the standard file decriptors and do a setpgrp().

       "d_volatile"
	   From d_volatile.U:

	   This variable conditionally defines the "HASVOLATILE" symbol, which indicates to the C
	   program that this C compiler knows about the volatile declaration.

       "d_vprintf"
	   From d_vprintf.U:

	   This variable conditionally defines the "HAS_VPRINTF" symbol, which indicates to the C
	   program that the vprintf() routine is available to printf with a pointer to an argu-
	   ment list.

       "d_wait4"
	   From d_wait4.U:

	   This variable conditionally defines the HAS_WAIT4 symbol, which indicates the wait4()
	   routine is available.

       "d_waitpid"
	   From d_waitpid.U:

	   This variable conditionally defines "HAS_WAITPID" if waitpid() is available to wait
	   for child process.

       "d_wcstombs"
	   From d_wcstombs.U:

	   This variable conditionally defines the "HAS_WCSTOMBS" symbol, which indicates to the
	   C program that the wcstombs() routine is available to convert wide character strings
	   to multibyte strings.

       "d_wctomb"
	   From d_wctomb.U:

	   This variable conditionally defines the "HAS_WCTOMB" symbol, which indicates to the C
	   program that the wctomb() routine is available to convert a wide character to a multi-
	   byte.

       "d_writev"
	   From d_writev.U:

	   This variable conditionally defines the "HAS_WRITEV" symbol, which indicates to the C
	   program that the writev() routine is available.

       "d_xenix"
	   From Guess.U:

	   This variable conditionally defines the symbol "XENIX", which alerts the C program
	   that it runs under Xenix.

       "date"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the date program.  After Configure runs, the value is reset to a plain "date" and
	   is not useful.

       "db_hashtype"
	   From i_db.U:

	   This variable contains the type of the hash structure element in the <db.h> header
	   file.  In older versions of "DB", it was int, while in newer ones it is u_int32_t.

       "db_prefixtype"
	   From i_db.U:

	   This variable contains the type of the prefix structure element in the <db.h> header
	   file.  In older versions of "DB", it was int, while in newer ones it is size_t.

       "db_version_major"
	   From i_db.U:

	   This variable contains the major version number of Berkeley "DB" found in the <db.h>
	   header file.

       "db_version_minor"
	   From i_db.U:

	   This variable contains the minor version number of Berkeley "DB" found in the <db.h>
	   header file.  For "DB" version 1 this is always 0.

       "db_version_patch"
	   From i_db.U:

	   This variable contains the patch version number of Berkeley "DB" found in the <db.h>
	   header file.  For "DB" version 1 this is always 0.

       "defvoidused"
	   From voidflags.U:

	   This variable contains the default value of the "VOIDUSED" symbol(15).

       "direntrytype"
	   From i_dirent.U:

	   This symbol is set to "struct direct" or "struct dirent" depending on whether dirent
	   is available or not. You should use this pseudo type to portably declare your direc-
	   tory entries.

       "dlext"
	   From dlext.U:

	   This variable contains the extension that is to be used for the dynamically loaded
	   modules that perl generaties.

       "dlsrc"
	   From dlsrc.U:

	   This variable contains the name of the dynamic loading file that will be used with the
	   package.

       "doublesize"
	   From doublesize.U:

	   This variable contains the value of the "DOUBLESIZE" symbol, which indicates to the C
	   program how many bytes there are in a double.

       "drand01"
	   From randfunc.U:

	   Indicates the macro to be used to generate normalized random numbers.  Uses randfunc,
	   often divided by (double) (((unsigned long) 1 << randbits)) in order to normalize the
	   result.  In C programs, the macro "Drand01" is mapped to drand01.

       "drand48_r_proto"
	   From d_drand48_r.U:

	   This variable encodes the prototype of drand48_r.  It is zero if d_drand48_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_drand48_r is defined.

       "dynamic_ext"
	   From Extensions.U:

	   This variable holds a list of "XS" extension files we want to link dynamically into
	   the package.  It is used by Makefile.

       e

       "eagain"
	   From nblock_io.U:

	   This variable bears the symbolic errno code set by read() when no data is present on
	   the file and non-blocking I/O was enabled (otherwise, read() blocks naturally).

       "ebcdic"
	   From ebcdic.U:

	   This variable conditionally defines "EBCDIC" if this system uses "EBCDIC" encoding.
	   Among other things, this means that the character ranges are not contiguous.  See
	   trnl.U

       "echo"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the echo program.  After Configure runs, the value is reset to a plain "echo" and
	   is not useful.

       "egrep"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the egrep program.  After Configure runs, the value is reset to a plain "egrep" and
	   is not useful.

       "emacs"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "endgrent_r_proto"
	   From d_endgrent_r.U:

	   This variable encodes the prototype of endgrent_r.  It is zero if d_endgrent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endgrent_r is
	   defined.

       "endhostent_r_proto"
	   From d_endhostent_r.U:

	   This variable encodes the prototype of endhostent_r.  It is zero if d_endhostent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endhostent_r is
	   defined.

       "endnetent_r_proto"
	   From d_endnetent_r.U:

	   This variable encodes the prototype of endnetent_r.	It is zero if d_endnetent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endnetent_r is
	   defined.

       "endprotoent_r_proto"
	   From d_endprotoent_r.U:

	   This variable encodes the prototype of endprotoent_r.  It is zero if d_endprotoent_r
	   is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endprotoent_r
	   is defined.

       "endpwent_r_proto"
	   From d_endpwent_r.U:

	   This variable encodes the prototype of endpwent_r.  It is zero if d_endpwent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endpwent_r is
	   defined.

       "endservent_r_proto"
	   From d_endservent_r.U:

	   This variable encodes the prototype of endservent_r.  It is zero if d_endservent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endservent_r is
	   defined.

       "eunicefix"
	   From Init.U:

	   When running under Eunice this variable contains a command which will convert a shell
	   script to the proper form of text file for it to be executable by the shell.  On other
	   systems it is a no-op.

       "exe_ext"
	   From Unix.U:

	   This is an old synonym for _exe.

       "expr"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the expr program.  After Configure runs, the value is reset to a plain "expr" and
	   is not useful.

       "extensions"
	   From Extensions.U:

	   This variable holds a list of all extension files (both "XS" and non-xs linked into
	   the package.  It is propagated to Config.pm and is typically used to test whether a
	   particular extesion is available.

       "extras"
	   From Extras.U:

	   This variable holds a list of extra modules to install.

       f

       "fflushNULL"
	   From fflushall.U:

	   This symbol, if defined, tells that fflush("NULL") does flush all pending stdio out-
	   put.

       "fflushall"
	   From fflushall.U:

	   This symbol, if defined, tells that to flush all pending stdio output one must loop
	   through all the stdio file handles stored in an array and fflush them.  Note that if
	   fflushNULL is defined, fflushall will not even be probed for and will be left unde-
	   fined.

       "find"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "firstmakefile"
	   From Unix.U:

	   This variable defines the first file searched by make.  On unix, it is makefile (then
	   Makefile).  On case-insensitive systems, it might be something else.  This is only
	   used to deal with convoluted make depend tricks.

       "flex"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "fpossize"
	   From fpossize.U:

	   This variable contains the size of a fpostype in bytes.

       "fpostype"
	   From fpostype.U:

	   This variable defines Fpos_t to be something like fpos_t, long, uint, or whatever type
	   is used to declare file positions in libc.

       "freetype"
	   From mallocsrc.U:

	   This variable contains the return type of free().  It is usually void, but occasion-
	   ally int.

       "from"
	   From Cross.U:

	   This variable contains the command used by Configure to copy files from the target
	   host.  Useful and available only during Perl build.	The string ":" if not cross-com-
	   piling.

       "full_ar"
	   From Loc_ar.U:

	   This variable contains the full pathname to "ar", whether or not the user has speci-
	   fied "portability".	This is only used in the Makefile.SH.

       "full_csh"
	   From d_csh.U:

	   This variable contains the full pathname to "csh", whether or not the user has speci-
	   fied "portability".	This is only used in the compiled C program, and we assume that
	   all systems which can share this executable will have the same full pathname to csh.

       "full_sed"
	   From Loc_sed.U:

	   This variable contains the full pathname to "sed", whether or not the user has speci-
	   fied "portability".	This is only used in the compiled C program, and we assume that
	   all systems which can share this executable will have the same full pathname to sed.

       g

       "gccansipedantic"
	   From gccvers.U:

	   If "GNU" cc (gcc) is used, this variable will enable (if set) the -ansi and -pedantic
	   ccflags for building core files (through cflags script). (See Porting/pumpkin.pod for
	   full description).

       "gccosandvers"
	   From gccvers.U:

	   If "GNU" cc (gcc) is used, this variable holds the operating system and version used
	   to compile gcc.  It is set to '' if not gcc, or if nothing useful can be parsed as the
	   os version.

       "gccversion"
	   From gccvers.U:

	   If "GNU" cc (gcc) is used, this variable holds 1 or 2 to indicate whether the compiler
	   is version 1 or 2.  This is used in setting some of the default cflags.  It is set to
	   '' if not gcc.

       "getgrent_r_proto"
	   From d_getgrent_r.U:

	   This variable encodes the prototype of getgrent_r.  It is zero if d_getgrent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getgrent_r is
	   defined.

       "getgrgid_r_proto"
	   From d_getgrgid_r.U:

	   This variable encodes the prototype of getgrgid_r.  It is zero if d_getgrgid_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getgrgid_r is
	   defined.

       "getgrnam_r_proto"
	   From d_getgrnam_r.U:

	   This variable encodes the prototype of getgrnam_r.  It is zero if d_getgrnam_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getgrnam_r is
	   defined.

       "gethostbyaddr_r_proto"
	   From d_gethostbyaddr_r.U:

	   This variable encodes the prototype of gethostbyaddr_r.  It is zero if d_gethost-
	   byaddr_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if
	   d_gethostbyaddr_r is defined.

       "gethostbyname_r_proto"
	   From d_gethostbyname_r.U:

	   This variable encodes the prototype of gethostbyname_r.  It is zero if d_gethostby-
	   name_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_geth-
	   ostbyname_r is defined.

       "gethostent_r_proto"
	   From d_gethostent_r.U:

	   This variable encodes the prototype of gethostent_r.  It is zero if d_gethostent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_gethostent_r is
	   defined.

       "getlogin_r_proto"
	   From d_getlogin_r.U:

	   This variable encodes the prototype of getlogin_r.  It is zero if d_getlogin_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getlogin_r is
	   defined.

       "getnetbyaddr_r_proto"
	   From d_getnetbyaddr_r.U:

	   This variable encodes the prototype of getnetbyaddr_r.  It is zero if d_getnetbyaddr_r
	   is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getnet-
	   byaddr_r is defined.

       "getnetbyname_r_proto"
	   From d_getnetbyname_r.U:

	   This variable encodes the prototype of getnetbyname_r.  It is zero if d_getnetbyname_r
	   is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getnetby-
	   name_r is defined.

       "getnetent_r_proto"
	   From d_getnetent_r.U:

	   This variable encodes the prototype of getnetent_r.	It is zero if d_getnetent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getnetent_r is
	   defined.

       "getprotobyname_r_proto"
	   From d_getprotobyname_r.U:

	   This variable encodes the prototype of getprotobyname_r.  It is zero if d_getprotoby-
	   name_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_get-
	   protobyname_r is defined.

       "getprotobynumber_r_proto"
	   From d_getprotobynumber_r.U:

	   This variable encodes the prototype of getprotobynumber_r.  It is zero if d_getproto-
	   bynumber_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if
	   d_getprotobynumber_r is defined.

       "getprotoent_r_proto"
	   From d_getprotoent_r.U:

	   This variable encodes the prototype of getprotoent_r.  It is zero if d_getprotoent_r
	   is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getprotoent_r
	   is defined.

       "getpwent_r_proto"
	   From d_getpwent_r.U:

	   This variable encodes the prototype of getpwent_r.  It is zero if d_getpwent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getpwent_r is
	   defined.

       "getpwnam_r_proto"
	   From d_getpwnam_r.U:

	   This variable encodes the prototype of getpwnam_r.  It is zero if d_getpwnam_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getpwnam_r is
	   defined.

       "getpwuid_r_proto"
	   From d_getpwuid_r.U:

	   This variable encodes the prototype of getpwuid_r.  It is zero if d_getpwuid_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getpwuid_r is
	   defined.

       "getservbyname_r_proto"
	   From d_getservbyname_r.U:

	   This variable encodes the prototype of getservbyname_r.  It is zero if d_getservby-
	   name_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_get-
	   servbyname_r is defined.

       "getservbyport_r_proto"
	   From d_getservbyport_r.U:

	   This variable encodes the prototype of getservbyport_r.  It is zero if d_getservby-
	   port_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_get-
	   servbyport_r is defined.

       "getservent_r_proto"
	   From d_getservent_r.U:

	   This variable encodes the prototype of getservent_r.  It is zero if d_getservent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getservent_r is
	   defined.

       "getspnam_r_proto"
	   From d_getspnam_r.U:

	   This variable encodes the prototype of getspnam_r.  It is zero if d_getspnam_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getspnam_r is
	   defined.

       "gidformat"
	   From gidf.U:

	   This variable contains the format string used for printing a Gid_t.

       "gidsign"
	   From gidsign.U:

	   This variable contains the signedness of a gidtype.	1 for unsigned, -1 for signed.

       "gidsize"
	   From gidsize.U:

	   This variable contains the size of a gidtype in bytes.

       "gidtype"
	   From gidtype.U:

	   This variable defines Gid_t to be something like gid_t, int, ushort, or whatever type
	   is used to declare the return type of getgid().  Typically, it is the type of group
	   ids in the kernel.

       "glibpth"
	   From libpth.U:

	   This variable holds the general path (space-separated) used to find libraries.  It may
	   contain directories that do not exist on this platform, libpth is the cleaned-up ver-
	   sion.

       "gmake"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the gmake program.  After Configure runs, the value is reset to a plain "gmake" and
	   is not useful.

       "gmtime_r_proto"
	   From d_gmtime_r.U:

	   This variable encodes the prototype of gmtime_r.  It is zero if d_gmtime_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_gmtime_r is defined.

       "gnulibc_version"
	   From d_gnulibc.U:

	   This variable contains the version number of the "GNU" C library.  It is usually some-
	   thing like 2.2.5.  It is a plain '' if this is not the "GNU" C library, or if the ver-
	   sion is unknown.

       "grep"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the grep program.  After Configure runs, the value is reset to a plain "grep" and
	   is not useful.

       "groupcat"
	   From nis.U:

	   This variable contains a command that produces the text of the /etc/group file.  This
	   is normally "cat /etc/group", but can be "ypcat group" when "NIS" is used.  On some
	   systems, such as os390, there may be no equivalent command, in which case this vari-
	   able is unset.

       "groupstype"
	   From groupstype.U:

	   This variable defines Groups_t to be something like gid_t, int, ushort, or whatever
	   type is used for the second argument to getgroups() and setgroups().  Usually, this is
	   the same as gidtype (gid_t), but sometimes it isn't.

       "gzip"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the gzip program.  After Configure runs, the value is reset to a plain "gzip" and
	   is not useful.

       h

       "h_fcntl"
	   From h_fcntl.U:

	   This is variable gets set in various places to tell i_fcntl that <fcntl.h> should be
	   included.

       "h_sysfile"
	   From h_sysfile.U:

	   This is variable gets set in various places to tell i_sys_file that <sys/file.h>
	   should be included.

       "hint"
	   From Oldconfig.U:

	   Gives the type of hints used for previous answers. May be one of "default", "recom-
	   mended" or "previous".

       "hostcat"
	   From nis.U:

	   This variable contains a command that produces the text of the /etc/hosts file.  This
	   is normally "cat /etc/hosts", but can be "ypcat hosts" when "NIS" is used.  On some
	   systems, such as os390, there may be no equivalent command, in which case this vari-
	   able is unset.

       i

       "i16size"
	   From perlxv.U:

	   This variable is the size of an I16 in bytes.

       "i16type"
	   From perlxv.U:

	   This variable contains the C type used for Perl's I16.

       "i32size"
	   From perlxv.U:

	   This variable is the size of an I32 in bytes.

       "i32type"
	   From perlxv.U:

	   This variable contains the C type used for Perl's I32.

       "i64size"
	   From perlxv.U:

	   This variable is the size of an I64 in bytes.

       "i64type"
	   From perlxv.U:

	   This variable contains the C type used for Perl's I64.

       "i8size"
	   From perlxv.U:

	   This variable is the size of an I8 in bytes.

       "i8type"
	   From perlxv.U:

	   This variable contains the C type used for Perl's I8.

       "i_arpainet"
	   From i_arpainet.U:

	   This variable conditionally defines the "I_ARPA_INET" symbol, and indicates whether a
	   C program should include <arpa/inet.h>.

       "i_bsdioctl"
	   From i_sysioctl.U:

	   This variable conditionally defines the "I_SYS_BSDIOCTL" symbol, which indicates to
	   the C program that <sys/bsdioctl.h> exists and should be included.

       "i_crypt"
	   From i_crypt.U:

	   This variable conditionally defines the "I_CRYPT" symbol, and indicates whether a C
	   program should include <crypt.h>.

       "i_db"
	   From i_db.U:

	   This variable conditionally defines the "I_DB" symbol, and indicates whether a C pro-
	   gram may include Berkeley's "DB" include file <db.h>.

       "i_dbm"
	   From i_dbm.U:

	   This variable conditionally defines the "I_DBM" symbol, which indicates to the C pro-
	   gram that <dbm.h> exists and should be included.

       "i_dirent"
	   From i_dirent.U:

	   This variable conditionally defines "I_DIRENT", which indicates to the C program that
	   it should include <dirent.h>.

       "i_dld"
	   From i_dld.U:

	   This variable conditionally defines the "I_DLD" symbol, which indicates to the C pro-
	   gram that <dld.h> ("GNU" dynamic loading) exists and should be included.

       "i_dlfcn"
	   From i_dlfcn.U:

	   This variable conditionally defines the "I_DLFCN" symbol, which indicates to the C
	   program that <dlfcn.h> exists and should be included.

       "i_fcntl"
	   From i_fcntl.U:

	   This variable controls the value of "I_FCNTL" (which tells the C program to include
	   <fcntl.h>).

       "i_float"
	   From i_float.U:

	   This variable conditionally defines the "I_FLOAT" symbol, and indicates whether a C
	   program may include <float.h> to get symbols like "DBL_MAX" or "DBL_MIN", i.e. machine
	   dependent floating point values.

       "i_fp"
	   From i_fp.U:

	   This variable conditionally defines the "I_FP" symbol, and indicates whether a C pro-
	   gram should include <fp.h>.

       "i_fp_class"
	   From i_fp_class.U:

	   This variable conditionally defines the "I_FP_CLASS" symbol, and indicates whether a C
	   program should include <fp_class.h>.

       "i_gdbm"
	   From i_gdbm.U:

	   This variable conditionally defines the "I_GDBM" symbol, which indicates to the C pro-
	   gram that <gdbm.h> exists and should be included.

       "i_grp"
	   From i_grp.U:

	   This variable conditionally defines the "I_GRP" symbol, and indicates whether a C pro-
	   gram should include <grp.h>.

       "i_ieeefp"
	   From i_ieeefp.U:

	   This variable conditionally defines the "I_IEEEFP" symbol, and indicates whether a C
	   program should include <ieeefp.h>.

       "i_inttypes"
	   From i_inttypes.U:

	   This variable conditionally defines the "I_INTTYPES" symbol, and indicates whether a C
	   program should include <inttypes.h>.

       "i_langinfo"
	   From i_langinfo.U:

	   This variable conditionally defines the "I_LANGINFO" symbol, and indicates whether a C
	   program should include <langinfo.h>.

       "i_libutil"
	   From i_libutil.U:

	   This variable conditionally defines the "I_LIBUTIL" symbol, and indicates whether a C
	   program should include <libutil.h>.

       "i_limits"
	   From i_limits.U:

	   This variable conditionally defines the "I_LIMITS" symbol, and indicates whether a C
	   program may include <limits.h> to get symbols like "WORD_BIT" and friends.

       "i_locale"
	   From i_locale.U:

	   This variable conditionally defines the "I_LOCALE" symbol, and indicates whether a C
	   program should include <locale.h>.

       "i_machcthr"
	   From i_machcthr.U:

	   This variable conditionally defines the "I_MACH_CTHREADS" symbol, and indicates
	   whether a C program should include <mach/cthreads.h>.

       "i_malloc"
	   From i_malloc.U:

	   This variable conditionally defines the "I_MALLOC" symbol, and indicates whether a C
	   program should include <malloc.h>.

       "i_math"
	   From i_math.U:

	   This variable conditionally defines the "I_MATH" symbol, and indicates whether a C
	   program may include <math.h>.

       "i_memory"
	   From i_memory.U:

	   This variable conditionally defines the "I_MEMORY" symbol, and indicates whether a C
	   program should include <memory.h>.

       "i_mntent"
	   From i_mntent.U:

	   This variable conditionally defines the "I_MNTENT" symbol, and indicates whether a C
	   program should include <mntent.h>.

       "i_ndbm"
	   From i_ndbm.U:

	   This variable conditionally defines the "I_NDBM" symbol, which indicates to the C pro-
	   gram that <ndbm.h> exists and should be included.

       "i_netdb"
	   From i_netdb.U:

	   This variable conditionally defines the "I_NETDB" symbol, and indicates whether a C
	   program should include <netdb.h>.

       "i_neterrno"
	   From i_neterrno.U:

	   This variable conditionally defines the "I_NET_ERRNO" symbol, which indicates to the C
	   program that <net/errno.h> exists and should be included.

       "i_netinettcp"
	   From i_netinettcp.U:

	   This variable conditionally defines the "I_NETINET_TCP" symbol, and indicates whether
	   a C program should include <netinet/tcp.h>.

       "i_niin"
	   From i_niin.U:

	   This variable conditionally defines "I_NETINET_IN", which indicates to the C program
	   that it should include <netinet/in.h>. Otherwise, you may try <sys/in.h>.

       "i_poll"
	   From i_poll.U:

	   This variable conditionally defines the "I_POLL" symbol, and indicates whether a C
	   program should include <poll.h>.

       "i_prot"
	   From i_prot.U:

	   This variable conditionally defines the "I_PROT" symbol, and indicates whether a C
	   program should include <prot.h>.

       "i_pthread"
	   From i_pthread.U:

	   This variable conditionally defines the "I_PTHREAD" symbol, and indicates whether a C
	   program should include <pthread.h>.

       "i_pwd"
	   From i_pwd.U:

	   This variable conditionally defines "I_PWD", which indicates to the C program that it
	   should include <pwd.h>.

       "i_rpcsvcdbm"
	   From i_dbm.U:

	   This variable conditionally defines the "I_RPCSVC_DBM" symbol, which indicates to the
	   C program that <rpcsvc/dbm.h> exists and should be included.  Some System V systems
	   might need this instead of <dbm.h>.

       "i_sfio"
	   From i_sfio.U:

	   This variable conditionally defines the "I_SFIO" symbol, and indicates whether a C
	   program should include <sfio.h>.

       "i_sgtty"
	   From i_termio.U:

	   This variable conditionally defines the "I_SGTTY" symbol, which indicates to the C
	   program that it should include <sgtty.h> rather than <termio.h>.

       "i_shadow"
	   From i_shadow.U:

	   This variable conditionally defines the "I_SHADOW" symbol, and indicates whether a C
	   program should include <shadow.h>.

       "i_socks"
	   From i_socks.U:

	   This variable conditionally defines the "I_SOCKS" symbol, and indicates whether a C
	   program should include <socks.h>.

       "i_stdarg"
	   From i_varhdr.U:

	   This variable conditionally defines the "I_STDARG" symbol, which indicates to the C
	   program that <stdarg.h> exists and should be included.

       "i_stddef"
	   From i_stddef.U:

	   This variable conditionally defines the "I_STDDEF" symbol, which indicates to the C
	   program that <stddef.h> exists and should be included.

       "i_stdlib"
	   From i_stdlib.U:

	   This variable conditionally defines the "I_STDLIB" symbol, which indicates to the C
	   program that <stdlib.h> exists and should be included.

       "i_string"
	   From i_string.U:

	   This variable conditionally defines the "I_STRING" symbol, which indicates that
	   <string.h> should be included rather than <strings.h>.

       "i_sunmath"
	   From i_sunmath.U:

	   This variable conditionally defines the "I_SUNMATH" symbol, and indicates whether a C
	   program should include <sunmath.h>.

       "i_sysaccess"
	   From i_sysaccess.U:

	   This variable conditionally defines the "I_SYS_ACCESS" symbol, and indicates whether a
	   C program should include <sys/access.h>.

       "i_sysdir"
	   From i_sysdir.U:

	   This variable conditionally defines the "I_SYS_DIR" symbol, and indicates whether a C
	   program should include <sys/dir.h>.

       "i_sysfile"
	   From i_sysfile.U:

	   This variable conditionally defines the "I_SYS_FILE" symbol, and indicates whether a C
	   program should include <sys/file.h> to get "R_OK" and friends.

       "i_sysfilio"
	   From i_sysioctl.U:

	   This variable conditionally defines the "I_SYS_FILIO" symbol, which indicates to the C
	   program that <sys/filio.h> exists and should be included in preference to
	   <sys/ioctl.h>.

       "i_sysin"
	   From i_niin.U:

	   This variable conditionally defines "I_SYS_IN", which indicates to the C program that
	   it should include <sys/in.h> instead of <netinet/in.h>.

       "i_sysioctl"
	   From i_sysioctl.U:

	   This variable conditionally defines the "I_SYS_IOCTL" symbol, which indicates to the C
	   program that <sys/ioctl.h> exists and should be included.

       "i_syslog"
	   From i_syslog.U:

	   This variable conditionally defines the "I_SYSLOG" symbol, and indicates whether a C
	   program should include <syslog.h>.

       "i_sysmman"
	   From i_sysmman.U:

	   This variable conditionally defines the "I_SYS_MMAN" symbol, and indicates whether a C
	   program should include <sys/mman.h>.

       "i_sysmode"
	   From i_sysmode.U:

	   This variable conditionally defines the "I_SYSMODE" symbol, and indicates whether a C
	   program should include <sys/mode.h>.

       "i_sysmount"
	   From i_sysmount.U:

	   This variable conditionally defines the "I_SYSMOUNT" symbol, and indicates whether a C
	   program should include <sys/mount.h>.

       "i_sysndir"
	   From i_sysndir.U:

	   This variable conditionally defines the "I_SYS_NDIR" symbol, and indicates whether a C
	   program should include <sys/ndir.h>.

       "i_sysparam"
	   From i_sysparam.U:

	   This variable conditionally defines the "I_SYS_PARAM" symbol, and indicates whether a
	   C program should include <sys/param.h>.

       "i_sysresrc"
	   From i_sysresrc.U:

	   This variable conditionally defines the "I_SYS_RESOURCE" symbol, and indicates whether
	   a C program should include <sys/resource.h>.

       "i_syssecrt"
	   From i_syssecrt.U:

	   This variable conditionally defines the "I_SYS_SECURITY" symbol, and indicates whether
	   a C program should include <sys/security.h>.

       "i_sysselct"
	   From i_sysselct.U:

	   This variable conditionally defines "I_SYS_SELECT", which indicates to the C program
	   that it should include <sys/select.h> in order to get the definition of struct
	   timeval.

       "i_syssockio"
	   From i_sysioctl.U:

	   This variable conditionally defines "I_SYS_SOCKIO" to indicate to the C program that
	   socket ioctl codes may be found in <sys/sockio.h> instead of <sys/ioctl.h>.

       "i_sysstat"
	   From i_sysstat.U:

	   This variable conditionally defines the "I_SYS_STAT" symbol, and indicates whether a C
	   program should include <sys/stat.h>.

       "i_sysstatfs"
	   From i_sysstatfs.U:

	   This variable conditionally defines the "I_SYSSTATFS" symbol, and indicates whether a
	   C program should include <sys/statfs.h>.

       "i_sysstatvfs"
	   From i_sysstatvfs.U:

	   This variable conditionally defines the "I_SYSSTATVFS" symbol, and indicates whether a
	   C program should include <sys/statvfs.h>.

       "i_systime"
	   From i_time.U:

	   This variable conditionally defines "I_SYS_TIME", which indicates to the C program
	   that it should include <sys/time.h>.

       "i_systimek"
	   From i_time.U:

	   This variable conditionally defines "I_SYS_TIME_KERNEL", which indicates to the C pro-
	   gram that it should include <sys/time.h> with "KERNEL" defined.

       "i_systimes"
	   From i_systimes.U:

	   This variable conditionally defines the "I_SYS_TIMES" symbol, and indicates whether a
	   C program should include <sys/times.h>.

       "i_systypes"
	   From i_systypes.U:

	   This variable conditionally defines the "I_SYS_TYPES" symbol, and indicates whether a
	   C program should include <sys/types.h>.

       "i_sysuio"
	   From i_sysuio.U:

	   This variable conditionally defines the "I_SYSUIO" symbol, and indicates whether a C
	   program should include <sys/uio.h>.

       "i_sysun"
	   From i_sysun.U:

	   This variable conditionally defines "I_SYS_UN", which indicates to the C program that
	   it should include <sys/un.h> to get "UNIX" domain socket definitions.

       "i_sysutsname"
	   From i_sysutsname.U:

	   This variable conditionally defines the "I_SYSUTSNAME" symbol, and indicates whether a
	   C program should include <sys/utsname.h>.

       "i_sysvfs"
	   From i_sysvfs.U:

	   This variable conditionally defines the "I_SYSVFS" symbol, and indicates whether a C
	   program should include <sys/vfs.h>.

       "i_syswait"
	   From i_syswait.U:

	   This variable conditionally defines "I_SYS_WAIT", which indicates to the C program
	   that it should include <sys/wait.h>.

       "i_termio"
	   From i_termio.U:

	   This variable conditionally defines the "I_TERMIO" symbol, which indicates to the C
	   program that it should include <termio.h> rather than <sgtty.h>.

       "i_termios"
	   From i_termio.U:

	   This variable conditionally defines the "I_TERMIOS" symbol, which indicates to the C
	   program that the "POSIX" <termios.h> file is to be included.

       "i_time"
	   From i_time.U:

	   This variable conditionally defines "I_TIME", which indicates to the C program that it
	   should include <time.h>.

       "i_unistd"
	   From i_unistd.U:

	   This variable conditionally defines the "I_UNISTD" symbol, and indicates whether a C
	   program should include <unistd.h>.

       "i_ustat"
	   From i_ustat.U:

	   This variable conditionally defines the "I_USTAT" symbol, and indicates whether a C
	   program should include <ustat.h>.

       "i_utime"
	   From i_utime.U:

	   This variable conditionally defines the "I_UTIME" symbol, and indicates whether a C
	   program should include <utime.h>.

       "i_values"
	   From i_values.U:

	   This variable conditionally defines the "I_VALUES" symbol, and indicates whether a C
	   program may include <values.h> to get symbols like "MAXLONG" and friends.

       "i_varargs"
	   From i_varhdr.U:

	   This variable conditionally defines "I_VARARGS", which indicates to the C program that
	   it should include <varargs.h>.

       "i_varhdr"
	   From i_varhdr.U:

	   Contains the name of the header to be included to get va_dcl definition.  Typically
	   one of varargs.h or stdarg.h.

       "i_vfork"
	   From i_vfork.U:

	   This variable conditionally defines the "I_VFORK" symbol, and indicates whether a C
	   program should include vfork.h.

       "ignore_versioned_solibs"
	   From libs.U:

	   This variable should be non-empty if non-versioned shared libraries (libfoo.so.x.y)
	   are to be ignored (because they cannot be linked against).

       "inc_version_list"
	   From inc_version_list.U:

	   This variable specifies the list of subdirectories in over which perl.c:incpush() and
	   lib/lib.pm will automatically search when adding directories to @"INC".  The elements
	   in the list are separated by spaces.  This is only useful if you have a perl library
	   directory tree structured like the default one.  See "INSTALL" for how this works.
	   The versioned site_perl directory was introduced in 5.005, so that is the lowest pos-
	   sible value.

       "inc_version_list_init"
	   From inc_version_list.U:

	   This variable holds the same list as inc_version_list, but each item is enclosed in
	   double quotes and separated by commas, suitable for use in the "PERL_INC_VERSION_LIST"
	   initialization.

       "incpath"
	   From usrinc.U:

	   This variable must preceed the normal include path to get hte right one, as in $inc-
	   path/usr/include or $incpath/usr/lib.  Value can be "" or /bsd43 on mips.

       "inews"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "installarchlib"
	   From archlib.U:

	   This variable is really the same as archlibexp but may differ on those systems using
	   "AFS". For extra portability, only this variable should be used in makefiles.

       "installbin"
	   From bin.U:

	   This variable is the same as binexp unless "AFS" is running in which case the user is
	   explicitely prompted for it. This variable should always be used in your makefiles for
	   maximum portability.

       "installman1dir"
	   From man1dir.U:

	   This variable is really the same as man1direxp, unless you are using "AFS" in which
	   case it points to the read/write location whereas man1direxp only points to the read-
	   only access location. For extra portability, you should only use this variable within
	   your makefiles.

       "installman3dir"
	   From man3dir.U:

	   This variable is really the same as man3direxp, unless you are using "AFS" in which
	   case it points to the read/write location whereas man3direxp only points to the read-
	   only access location. For extra portability, you should only use this variable within
	   your makefiles.

       "installprefix"
	   From installprefix.U:

	   This variable holds the name of the directory below which "make install" will install
	   the package.  For most users, this is the same as prefix.  However, it is useful for
	   installing the software into a different (usually temporary) location after which it
	   can be bundled up and moved somehow to the final location specified by prefix.

       "installprefixexp"
	   From installprefix.U:

	   This variable holds the full absolute path of installprefix with all ~-expansion done.

       "installprivlib"
	   From privlib.U:

	   This variable is really the same as privlibexp but may differ on those systems using
	   "AFS". For extra portability, only this variable should be used in makefiles.

       "installscript"
	   From scriptdir.U:

	   This variable is usually the same as scriptdirexp, unless you are on a system running
	   "AFS", in which case they may differ slightly. You should always use this variable
	   within your makefiles for portability.

       "installsitearch"
	   From sitearch.U:

	   This variable is really the same as sitearchexp but may differ on those systems using
	   "AFS". For extra portability, only this variable should be used in makefiles.

       "installsitebin"
	   From sitebin.U:

	   This variable is usually the same as sitebinexp, unless you are on a system running
	   "AFS", in which case they may differ slightly. You should always use this variable
	   within your makefiles for portability.

       "installsitelib"
	   From sitelib.U:

	   This variable is really the same as sitelibexp but may differ on those systems using
	   "AFS". For extra portability, only this variable should be used in makefiles.

       "installstyle"
	   From installstyle.U:

	   This variable describes the "style" of the perl installation.  This is intended to be
	   useful for tools that need to manipulate entire perl distributions.	Perl itself
	   doesn't use this to find its libraries -- the library directories are stored directly
	   in Config.pm.  Currently, there are only two styles:  "lib" and lib/perl5.  The
	   default library locations (e.g. privlib, sitelib) are either $prefix/lib or $pre-
	   fix/lib/perl5.  The former is useful if $prefix is a directory dedicated to perl (e.g.
	   /opt/perl), while the latter is useful if $prefix is shared by many packages, e.g. if
	   $prefix=/usr/local.

	   Unfortunately, while this "style" variable is used to set defaults for all three
	   directory hierarchies (core, vendor, and site), there is no guarantee that the same
	   style is actually appropriate for all those directories.  For example, $prefix might
	   be /opt/perl, but $siteprefix might be /usr/local.  (Perhaps, in retrospect, the "lib"
	   style should never have been supported, but it did seem like a nice idea at the time.)

	   The situation is even less clear for tools such as MakeMaker that can be used to
	   install additional modules into non-standard places.  For example, if a user intends
	   to install a module into a private directory (perhaps by setting "PREFIX" on the Make-
	   file.PL command line), then there is no reason to assume that the Configure-time
	   $installstyle setting will be relevant for that "PREFIX".

	   This may later be extended to include other information, so be careful with pattern-
	   matching on the results.

	   For compatibility with perl5.005 and earlier, the default setting is based on whether
	   or not $prefix contains the string "perl".

       "installusrbinperl"
	   From instubperl.U:

	   This variable tells whether Perl should be installed also as /usr/bin/perl in addition
	   to $installbin/perl

       "installvendorarch"
	   From vendorarch.U:

	   This variable is really the same as vendorarchexp but may differ on those systems
	   using "AFS". For extra portability, only this variable should be used in makefiles.

       "installvendorbin"
	   From vendorbin.U:

	   This variable is really the same as vendorbinexp but may differ on those systems using
	   "AFS". For extra portability, only this variable should be used in makefiles.

       "installvendorlib"
	   From vendorlib.U:

	   This variable is really the same as vendorlibexp but may differ on those systems using
	   "AFS". For extra portability, only this variable should be used in makefiles.

       "intsize"
	   From intsize.U:

	   This variable contains the value of the "INTSIZE" symbol, which indicates to the C
	   program how many bytes there are in an int.

       "issymlink"
	   From issymlink.U:

	   This variable holds the test command to test for a symbolic link (if they are sup-
	   ported).  Typical values include "test -h" and "test -L".

       "ivdformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "IV" as a signed
	   decimal integer.

       "ivsize"
	   From perlxv.U:

	   This variable is the size of an "IV" in bytes.

       "ivtype"
	   From perlxv.U:

	   This variable contains the C type used for Perl's "IV".

       k

       "known_extensions"
	   From Extensions.U:

	   This variable holds a list of all "XS" extensions included in the package.

       "ksh"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       l

       "ld"
	   From dlsrc.U:

	   This variable indicates the program to be used to link libraries for dynamic loading.
	   On some systems, it is "ld".  On "ELF" systems, it should be $cc.  Mostly, we'll try
	   to respect the hint file setting.

       "lddlflags"
	   From dlsrc.U:

	   This variable contains any special flags that might need to be passed to $ld to create
	   a shared library suitable for dynamic loading.  It is up to the makefile to use it.
	   For hpux, it should be "-b".  For sunos 4.1, it is empty.

       "ldflags"
	   From ccflags.U:

	   This variable contains any additional C loader flags desired by the user.  It is up to
	   the Makefile to use this.

       "ldflags_uselargefiles"
	   From uselfs.U:

	   This variable contains the loader flags needed by large file builds and added to
	   ldflags by hints files.

       "ldlibpthname"
	   From libperl.U:

	   This variable holds the name of the shared library search path, often
	   "LD_LIBRARY_PATH".  To get an empty string, the hints file must set this to "none".

       "less"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the less program.  After Configure runs, the value is reset to a plain "less" and
	   is not useful.

       "lib_ext"
	   From Unix.U:

	   This is an old synonym for _a.

       "libc"
	   From libc.U:

	   This variable contains the location of the C library.

       "libperl"
	   From libperl.U:

	   The perl executable is obtained by linking perlmain.c with libperl, any static exten-
	   sions (usually just DynaLoader), and any other libraries needed on this system.
	   libperl is usually libperl.a, but can also be libperl.so.xxx if the user wishes to
	   build a perl executable with a shared library.

       "libpth"
	   From libpth.U:

	   This variable holds the general path (space-separated) used to find libraries. It is
	   intended to be used by other units.

       "libs"
	   From libs.U:

	   This variable holds the additional libraries we want to use.  It is up to the Makefile
	   to deal with it.  The list can be empty.

       "libsdirs"
	   From libs.U:

	   This variable holds the directory names aka dirnames of the libraries we found and
	   accepted, duplicates are removed.

       "libsfiles"
	   From libs.U:

	   This variable holds the filenames aka basenames of the libraries we found and
	   accepted.

       "libsfound"
	   From libs.U:

	   This variable holds the full pathnames of the libraries we found and accepted.

       "libspath"
	   From libs.U:

	   This variable holds the directory names probed for libraries.

       "libswanted"
	   From Myinit.U:

	   This variable holds a list of all the libraries we want to search.  The order is cho-
	   sen to pick up the c library ahead of ucb or bsd libraries for SVR4.

       "libswanted_uselargefiles"
	   From uselfs.U:

	   This variable contains the libraries needed by large file builds and added to ldflags
	   by hints files.  It is a space separated list of the library names without the "lib"
	   prefix or any suffix, just like libswanted..

       "line"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "lint"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "lkflags"
	   From ccflags.U:

	   This variable contains any additional C partial linker flags desired by the user.  It
	   is up to the Makefile to use this.

       "ln"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the ln program.  After Configure runs, the value is reset to a plain "ln" and is
	   not useful.

       "lns"
	   From lns.U:

	   This variable holds the name of the command to make symbolic links (if they are sup-
	   ported).  It can be used in the Makefile. It is either "ln -s" or "ln"

       "localtime_r_proto"
	   From d_localtime_r.U:

	   This variable encodes the prototype of localtime_r.	It is zero if d_localtime_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_localtime_r is
	   defined.

       "locincpth"
	   From ccflags.U:

	   This variable contains a list of additional directories to be searched by the com-
	   piler.  The appropriate "-I" directives will be added to ccflags.  This is intended to
	   simplify setting local directories from the Configure command line.	It's not much,
	   but it parallels the loclibpth stuff in libpth.U.

       "loclibpth"
	   From libpth.U:

	   This variable holds the paths (space-separated) used to find local libraries.  It is
	   prepended to libpth, and is intended to be easily set from the command line.

       "longdblsize"
	   From d_longdbl.U:

	   This variable contains the value of the "LONG_DOUBLESIZE" symbol, which indicates to
	   the C program how many bytes there are in a long double, if this system supports long
	   doubles.

       "longlongsize"
	   From d_longlong.U:

	   This variable contains the value of the "LONGLONGSIZE" symbol, which indicates to the
	   C program how many bytes there are in a long long, if this system supports long long.

       "longsize"
	   From intsize.U:

	   This variable contains the value of the "LONGSIZE" symbol, which indicates to the C
	   program how many bytes there are in a long.

       "lp"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "lpr"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "ls"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the ls program.  After Configure runs, the value is reset to a plain "ls" and is
	   not useful.

       "lseeksize"
	   From lseektype.U:

	   This variable defines lseektype to be something like off_t, long, or whatever type is
	   used to declare lseek offset's type in the kernel (which also appears to be lseek's
	   return type).

       "lseektype"
	   From lseektype.U:

	   This variable defines lseektype to be something like off_t, long, or whatever type is
	   used to declare lseek offset's type in the kernel (which also appears to be lseek's
	   return type).

       m

       "mail"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "mailx"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "make"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the make program.  After Configure runs, the value is reset to a plain "make" and
	   is not useful.

       "make_set_make"
	   From make.U:

	   Some versions of "make" set the variable "MAKE".  Others do not.  This variable con-
	   tains the string to be included in Makefile.SH so that "MAKE" is set if needed, and
	   not if not needed.  Possible values are:

	   make_set_make="#"	    # If your make program handles this for you,

	   make_set_make="MAKE=$make"	 # if it doesn't.

	   This uses a comment character to distinguish a "set" value (from a previous config.sh
	   or Configure "-D" option) from an uncomputed value.

       "mallocobj"
	   From mallocsrc.U:

	   This variable contains the name of the malloc.o that this package generates, if that
	   malloc.o is preferred over the system malloc.  Otherwise the value is null.	This
	   variable is intended for generating Makefiles.  See mallocsrc.

       "mallocsrc"
	   From mallocsrc.U:

	   This variable contains the name of the malloc.c that comes with the package, if that
	   malloc.c is preferred over the system malloc.  Otherwise the value is null.	This
	   variable is intended for generating Makefiles.

       "malloctype"
	   From mallocsrc.U:

	   This variable contains the kind of ptr returned by malloc and realloc.

       "man1dir"
	   From man1dir.U:

	   This variable contains the name of the directory in which manual source pages are to
	   be put.  It is the responsibility of the Makefile.SH to get the value of this into the
	   proper command.  You must be prepared to do the ~name expansion yourself.

       "man1direxp"
	   From man1dir.U:

	   This variable is the same as the man1dir variable, but is filename expanded at config-
	   uration time, for convenient use in makefiles.

       "man1ext"
	   From man1dir.U:

	   This variable contains the extension that the manual page should have: one of "n",
	   "l", or 1.  The Makefile must supply the ..	See man1dir.

       "man3dir"
	   From man3dir.U:

	   This variable contains the name of the directory in which manual source pages are to
	   be put.  It is the responsibility of the Makefile.SH to get the value of this into the
	   proper command.  You must be prepared to do the ~name expansion yourself.

       "man3direxp"
	   From man3dir.U:

	   This variable is the same as the man3dir variable, but is filename expanded at config-
	   uration time, for convenient use in makefiles.

       "man3ext"
	   From man3dir.U:

	   This variable contains the extension that the manual page should have: one of "n",
	   "l", or 3.  The Makefile must supply the ..	See man3dir.

       "mips_type"
	   From usrinc.U:

	   This variable holds the environment type for the mips system.  Possible values are
	   "BSD 4.3" and "System V".

       "mkdir"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the mkdir program.  After Configure runs, the value is reset to a plain "mkdir" and
	   is not useful.

       "mmaptype"
	   From d_mmap.U:

	   This symbol contains the type of pointer returned by mmap() (and simultaneously the
	   type of the first argument).  It can be "void *" or "caddr_t".

       "modetype"
	   From modetype.U:

	   This variable defines modetype to be something like mode_t, int, unsigned short, or
	   whatever type is used to declare file modes for system calls.

       "more"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the more program.  After Configure runs, the value is reset to a plain "more" and
	   is not useful.

       "multiarch"
	   From multiarch.U:

	   This variable conditionally defines the "MULTIARCH" symbol which signifies the pres-
	   ence of multiplatform files.  This is normally set by hints files.

       "mv"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "myarchname"
	   From archname.U:

	   This variable holds the architecture name computed by Configure in a previous run. It
	   is not intended to be perused by any user and should never be set in a hint file.

       "mydomain"
	   From myhostname.U:

	   This variable contains the eventual value of the "MYDOMAIN" symbol, which is the
	   domain of the host the program is going to run on.  The domain must be appended to
	   myhostname to form a complete host name.  The dot comes with mydomain, and need not be
	   supplied by the program.

       "myhostname"
	   From myhostname.U:

	   This variable contains the eventual value of the "MYHOSTNAME" symbol, which is the
	   name of the host the program is going to run on.  The domain is not kept with host-
	   name, but must be gotten from mydomain.  The dot comes with mydomain, and need not be
	   supplied by the program.

       "myuname"
	   From Oldconfig.U:

	   The output of "uname -a" if available, otherwise the hostname. On Xenix, pseudo vari-
	   ables assignments in the output are stripped, thank you. The whole thing is then
	   lower-cased.

       n

       "n" From n.U:

	   This variable contains the "-n" flag if that is what causes the echo command to sup-
	   press newline.  Otherwise it is null.  Correct usage is $echo $n "prompt for a ques-
	   tion: $c".

       "need_va_copy"
	   From need_va_copy.U:

	   This symbol, if defined, indicates that the system stores the variable argument list
	   datatype, va_list, in a format that cannot be copied by simple assignment, so that
	   some other means must be used when copying is required.  As such systems vary in their
	   provision (or non-provision) of copying mechanisms, handy.h defines a platform- "inde-
	   pendent" macro, Perl_va_copy(src, dst), to do the job.

       "netdb_hlen_type"
	   From netdbtype.U:

	   This variable holds the type used for the 2nd argument to gethostbyaddr().  Usually,
	   this is int or size_t or unsigned.  This is only useful if you have gethostbyaddr(),
	   naturally.

       "netdb_host_type"
	   From netdbtype.U:

	   This variable holds the type used for the 1st argument to gethostbyaddr().  Usually,
	   this is char * or void *,  possibly with or without a const prefix.	This is only use-
	   ful if you have gethostbyaddr(), naturally.

       "netdb_name_type"
	   From netdbtype.U:

	   This variable holds the type used for the argument to gethostbyname().  Usually, this
	   is char * or const char *.  This is only useful if you have gethostbyname(), natu-
	   rally.

       "netdb_net_type"
	   From netdbtype.U:

	   This variable holds the type used for the 1st argument to getnetbyaddr().  Usually,
	   this is int or long.  This is only useful if you have getnetbyaddr(), naturally.

       "nm"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the nm program.  After Configure runs, the value is reset to a plain "nm" and is
	   not useful.

       "nm_opt"
	   From usenm.U:

	   This variable holds the options that may be necessary for nm.

       "nm_so_opt"
	   From usenm.U:

	   This variable holds the options that may be necessary for nm to work on a shared
	   library but that can not be used on an archive library.  Currently, this is only used
	   by Linux, where nm --dynamic is *required* to get symbols from an "ELF" library which
	   has been stripped, but nm --dynamic is *fatal* on an archive library.  Maybe Linux
	   should just always set usenm=false.

       "nonxs_ext"
	   From Extensions.U:

	   This variable holds a list of all non-xs extensions included in the package.  All of
	   them will be built.

       "nroff"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the nroff program.  After Configure runs, the value is reset to a plain "nroff" and
	   is not useful.

       "nvEUformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "NV" using %E-ish
	   floating point format.

       "nvFUformat"
	   From perlxvf.U:

	   This variable confains the format string used for printing a Perl "NV" using %F-ish
	   floating point format.

       "nvGUformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "NV" using %G-ish
	   floating point format.

       "nv_preserves_uv_bits"
	   From perlxv.U:

	   This variable indicates how many of bits type uvtype a variable nvtype can preserve.

       "nveformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "NV" using %e-ish
	   floating point format.

       "nvfformat"
	   From perlxvf.U:

	   This variable confains the format string used for printing a Perl "NV" using %f-ish
	   floating point format.

       "nvgformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "NV" using %g-ish
	   floating point format.

       "nvsize"
	   From perlxv.U:

	   This variable is the size of an "NV" in bytes.

       "nvtype"
	   From perlxv.U:

	   This variable contains the C type used for Perl's "NV".

       o

       "o_nonblock"
	   From nblock_io.U:

	   This variable bears the symbol value to be used during open() or fcntl() to turn on
	   non-blocking I/O for a file descriptor. If you wish to switch between blocking and
	   non-blocking, you may try ioctl("FIOSNBIO") instead, but that is only supported by
	   some devices.

       "obj_ext"
	   From Unix.U:

	   This is an old synonym for _o.

       "old_pthread_create_joinable"
	   From d_pthrattrj.U:

	   This variable defines the constant to use for creating joinable (aka undetached)
	   pthreads.  Unused if pthread.h defines "PTHREAD_CREATE_JOINABLE".  If used, possible
	   values are "PTHREAD_CREATE_UNDETACHED" and "__UNDETACHED".

       "optimize"
	   From ccflags.U:

	   This variable contains any optimizer/debugger flag that should be used.  It is up to
	   the Makefile to use it.

       "orderlib"
	   From orderlib.U:

	   This variable is "true" if the components of libraries must be ordered (with `lorder
	   $* | tsort`) before placing them in an archive.  Set to "false" if ranlib or ar can
	   generate random libraries.

       "osname"
	   From Oldconfig.U:

	   This variable contains the operating system name (e.g. sunos, solaris, hpux, etc.).
	   It can be useful later on for setting defaults.  Any spaces are replaced with under-
	   scores.  It is set to a null string if we can't figure it out.

       "osvers"
	   From Oldconfig.U:

	   This variable contains the operating system version (e.g.  4.1.3, 5.2, etc.).  It is
	   primarily used for helping select an appropriate hints file, but might be useful else-
	   where for setting defaults.	It is set to '' if we can't figure it out.  We try to be
	   flexible about how much of the version number to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3
	   are essentially the same for this package, hints files might just be os_4.0 or os_4.1,
	   etc., not keeping separate files for each little release.

       "otherlibdirs"
	   From otherlibdirs.U:

	   This variable contains a colon-separated set of paths for the perl binary to search
	   for additional library files or modules.  These directories will be tacked to the end
	   of @"INC".  Perl will automatically search below each path for version- and architec-
	   ture-specific directories.  See inc_version_list for more details.  A value of " "
	   means "none" and is used to preserve this value for the next run through Configure.

       p

       "package"
	   From package.U:

	   This variable contains the name of the package being constructed.  It is primarily
	   intended for the use of later Configure units.

       "pager"
	   From pager.U:

	   This variable contains the name of the preferred pager on the system.  Usual values
	   are (the full pathnames of) more, less, pg, or cat.

       "passcat"
	   From nis.U:

	   This variable contains a command that produces the text of the /etc/passwd file.  This
	   is normally "cat /etc/passwd", but can be "ypcat passwd" when "NIS" is used.  On some
	   systems, such as os390, there may be no equivalent command, in which case this vari-
	   able is unset.

       "patchlevel"
	   From patchlevel.U:

	   The patchlevel level of this package.  The value of patchlevel comes from the patch-
	   level.h file.  In a version number such as 5.6.1, this is the 6.  In patchlevel.h,
	   this is referred to as "PERL_VERSION".

       "path_sep"
	   From Unix.U:

	   This is an old synonym for p_ in Head.U, the character used to separate elements in
	   the command shell search "PATH".

       "perl5"
	   From perl5.U:

	   This variable contains the full path (if any) to a previously installed perl5.005 or
	   later suitable for running the script to determine inc_version_list.

       "perl"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "perl_patchlevel"
	   From patchlevel.U:

	   This is the Perl patch level, a numeric change identifier, as defined by whichever
	   source code maintenance system is used to maintain the patches; currently Perforce.
	   It does not correlate with the Perl version numbers or the maintenance versus develop-
	   ment dichotomy except by also being increasing.

       "perladmin"
	   From perladmin.U:

	   Electronic mail address of the perl5 administrator.

       "perllibs"
	   From End.U:

	   The list of libraries needed by Perl only (any libraries needed by extensions only
	   will by dropped, if using dynamic loading).

       "perlpath"
	   From perlpath.U:

	   This variable contains the eventual value of the "PERLPATH" symbol, which contains the
	   name of the perl interpreter to be used in shell scripts and in the "eval "exec""
	   idiom.  This variable is not necessarily the pathname of the file containing the perl
	   interpreter; you must append the executable extension (_exe) if it is not already
	   present.  Note that Perl code that runs during the Perl build process cannot reference
	   this variable, as Perl may not have been installed, or even if installed, may be a
	   different version of Perl.

       "pg"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the pg program.  After Configure runs, the value is reset to a plain "pg" and is
	   not useful.

       "phostname"
	   From myhostname.U:

	   This variable contains the eventual value of the "PHOSTNAME" symbol, which is a com-
	   mand that can be fed to popen() to get the host name.  The program should probably not
	   presume that the domain is or isn't there already.

       "pidtype"
	   From pidtype.U:

	   This variable defines "PIDTYPE" to be something like pid_t, int, ushort, or whatever
	   type is used to declare process ids in the kernel.

       "plibpth"
	   From libpth.U:

	   Holds the private path used by Configure to find out the libraries.	Its value is
	   prepend to libpth. This variable takes care of special machines, like the mips.  Usu-
	   ally, it should be empty.

       "pm_apiversion"
	   From xs_apiversion.U:

	   This variable contains the version of the oldest perl compatible with the present
	   perl.  (That is, pure perl modules written for $pm_apiversion will still work for the
	   current version).  perl.c:incpush() and lib/lib.pm will automatically search in
	   $sitelib for older directories across major versions back to pm_apiversion.	This is
	   only useful if you have a perl library directory tree structured like the default one.
	   The versioned site_perl library was introduced in 5.005, so that's the default setting
	   for this variable.  It's hard to imagine it changing before Perl6.  It is included
	   here for symmetry with xs_apiveprsion -- the searching algorithms will (presumably) be
	   similar.  See the "INSTALL" file for how this works.

       "pmake"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "pr"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "prefix"
	   From prefix.U:

	   This variable holds the name of the directory below which the user will install the
	   package.  Usually, this is /usr/local, and executables go in /usr/local/bin, library
	   stuff in /usr/local/lib, man pages in /usr/local/man, etc.  It is only used to set
	   defaults for things in bin.U, mansrc.U, privlib.U, or scriptdir.U.

       "prefixexp"
	   From prefix.U:

	   This variable holds the full absolute path of the directory below which the user will
	   install the package.  Derived from prefix.

       "privlib"
	   From privlib.U:

	   This variable contains the eventual value of the "PRIVLIB" symbol, which is the name
	   of the private library for this package.  It may have a ~ on the front. It is up to
	   the makefile to eventually create this directory while performing installation (with ~
	   substitution).

       "privlibexp"
	   From privlib.U:

	   This variable is the ~name expanded version of privlib, so that you may use it
	   directly in Makefiles or shell scripts.

       "procselfexe"
	   From d_procselfexe.U:

	   If d_procselfexe is defined, $procselfexe is the filename of the symbolic link point-
	   ing to the absolute pathname of the executing program.

       "prototype"
	   From prototype.U:

	   This variable holds the eventual value of "CAN_PROTOTYPE", which indicates the C com-
	   piler can handle funciton prototypes.

       "ptrsize"
	   From ptrsize.U:

	   This variable contains the value of the "PTRSIZE" symbol, which indicates to the C
	   program how many bytes there are in a pointer.

       q

       "quadkind"
	   From quadtype.U:

	   This variable, if defined, encodes the type of a quad: 1 = int, 2 = long, 3 = long
	   long, 4 = int64_t.

       "quadtype"
	   From quadtype.U:

	   This variable defines Quad_t to be something like long, int, long long, int64_t, or
	   whatever type is used for 64-bit integers.

       r

       "randbits"
	   From randfunc.U:

	   Indicates how many bits are produced by the function used to generate normalized ran-
	   dom numbers.

       "randfunc"
	   From randfunc.U:

	   Indicates the name of the random number function to use.  Values include drand48, ran-
	   dom, and rand. In C programs, the "Drand01" macro is defined to generate uniformly
	   distributed random numbers over the range [0., 1.[ (see drand01 and nrand).

       "random_r_proto"
	   From d_random_r.U:

	   This variable encodes the prototype of random_r.  It is zero if d_random_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_random_r is defined.

       "randseedtype"
	   From randfunc.U:

	   Indicates the type of the argument of the seedfunc.

       "ranlib"
	   From orderlib.U:

	   This variable is set to the pathname of the ranlib program, if it is needed to gener-
	   ate random libraries.  Set to ":" if ar can generate random libraries or if random
	   libraries are not supported

       "rd_nodata"
	   From nblock_io.U:

	   This variable holds the return code from read() when no data is present. It should be
	   -1, but some systems return 0 when "O_NDELAY" is used, which is a shame because you
	   cannot make the difference between no data and an EOF.. Sigh!

       "readdir64_r_proto"
	   From d_readdir64_r.U:

	   This variable encodes the prototype of readdir64_r.	It is zero if d_readdir64_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_readdir64_r is
	   defined.

       "readdir_r_proto"
	   From d_readdir_r.U:

	   This variable encodes the prototype of readdir_r.  It is zero if d_readdir_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_readdir_r is defined.

       "revision"
	   From patchlevel.U:

	   The value of revision comes from the patchlevel.h file.  In a version number such as
	   5.6.1, this is the 5.  In patchlevel.h, this is referred to as "PERL_REVISION".

       "rm"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the rm program.  After Configure runs, the value is reset to a plain "rm" and is
	   not useful.

       "rmail"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "run"
	   From Cross.U:

	   This variable contains the command used by Configure to copy and execute a cross-com-
	   piled executable in the target host.  Useful and available only during Perl build.
	   Empty string '' if not cross-compiling.

       "runnm"
	   From usenm.U:

	   This variable contains "true" or "false" depending whether the nm extraction should be
	   performed or not, according to the value of usenm and the flags on the Configure com-
	   mand line.

       s

       "sPRIEUldbl"
	   From longdblfio.U:

	   This variable, if defined, contains the string used by stdio to format long doubles
	   (format "E") for output.  The "U" in the name is to separate this from sPRIeldbl so
	   that even case-blind systems can see the difference.

       "sPRIFUldbl"
	   From longdblfio.U:

	   This variable, if defined, contains the string used by stdio to format long doubles
	   (format "F") for output.  The "U" in the name is to separate this from sPRIfldbl so
	   that even case-blind systems can see the difference.

       "sPRIGUldbl"
	   From longdblfio.U:

	   This variable, if defined, contains the string used by stdio to format long doubles
	   (format "G") for output.  The "U" in the name is to separate this from sPRIgldbl so
	   that even case-blind systems can see the difference.

       "sPRIXU64"
	   From quadfio.U:

	   This variable, if defined, contains the string used by stdio to format 64-bit hExADEC-
	   imAl numbers (format "X") for output.  The "U" in the name is to separate this from
	   sPRIx64 so that even case-blind systems can see the difference.

       "sPRId64"
	   From quadfio.U:

	   This variable, if defined, contains the string used by stdio to format 64-bit decimal
	   numbers (format "d") for output.

       "sPRIeldbl"
	   From longdblfio.U:

	   This variable, if defined, contains the string used by stdio to format long doubles
	   (format "e") for output.

       "sPRIfldbl"
	   From longdblfio.U:

	   This variable, if defined, contains the string used by stdio to format long doubles
	   (format "f") for output.

       "sPRIgldbl"
	   From longdblfio.U:

	   This variable, if defined, contains the string used by stdio to format long doubles
	   (format "g") for output.

       "sPRIi64"
	   From quadfio.U:

	   This variable, if defined, contains the string used by stdio to format 64-bit decimal
	   numbers (format "i") for output.

       "sPRIo64"
	   From quadfio.U:

	   This variable, if defined, contains the string used by stdio to format 64-bit octal
	   numbers (format "o") for output.

       "sPRIu64"
	   From quadfio.U:

	   This variable, if defined, contains the string used by stdio to format 64-bit unsigned
	   decimal numbers (format "u") for output.

       "sPRIx64"
	   From quadfio.U:

	   This variable, if defined, contains the string used by stdio to format 64-bit hexadec-
	   imal numbers (format "x") for output.

       "sSCNfldbl"
	   From longdblfio.U:

	   This variable, if defined, contains the string used by stdio to format long doubles
	   (format "f") for input.

       "sched_yield"
	   From d_pthread_y.U:

	   This variable defines the way to yield the execution of the current thread.

       "scriptdir"
	   From scriptdir.U:

	   This variable holds the name of the directory in which the user wants to put publicly
	   scripts for the package in question.  It is either the same directory as for binaries,
	   or a special one that can be mounted across different architectures, like /usr/share.
	   Programs must be prepared to deal with ~name expansion.

       "scriptdirexp"
	   From scriptdir.U:

	   This variable is the same as scriptdir, but is filename expanded at configuration
	   time, for programs not wanting to bother with it.

       "sed"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the sed program.	After Configure runs, the value is reset to a plain "sed" and is
	   not useful.

       "seedfunc"
	   From randfunc.U:

	   Indicates the random number generating seed function.  Values include srand48, sran-
	   dom, and srand.

       "selectminbits"
	   From selectminbits.U:

	   This variable holds the minimum number of bits operated by select.  That is, if you do
	   select(n, ...), how many bits at least will be cleared in the masks if some activity
	   is detected.  Usually this is either n or 32*ceil(n/32), especially many little-endi-
	   ans do the latter.  This is only useful if you have select(), naturally.

       "selecttype"
	   From selecttype.U:

	   This variable holds the type used for the 2nd, 3rd, and 4th arguments to select.  Usu-
	   ally, this is "fd_set *", if "HAS_FD_SET" is defined, and "int *" otherwise.  This is
	   only useful if you have select(), naturally.

       "sendmail"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "setgrent_r_proto"
	   From d_setgrent_r.U:

	   This variable encodes the prototype of setgrent_r.  It is zero if d_setgrent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setgrent_r is
	   defined.

       "sethostent_r_proto"
	   From d_sethostent_r.U:

	   This variable encodes the prototype of sethostent_r.  It is zero if d_sethostent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_sethostent_r is
	   defined.

       "setlocale_r_proto"
	   From d_setlocale_r.U:

	   This variable encodes the prototype of setlocale_r.	It is zero if d_setlocale_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setlocale_r is
	   defined.

       "setnetent_r_proto"
	   From d_setnetent_r.U:

	   This variable encodes the prototype of setnetent_r.	It is zero if d_setnetent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setnetent_r is
	   defined.

       "setprotoent_r_proto"
	   From d_setprotoent_r.U:

	   This variable encodes the prototype of setprotoent_r.  It is zero if d_setprotoent_r
	   is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setprotoent_r
	   is defined.

       "setpwent_r_proto"
	   From d_setpwent_r.U:

	   This variable encodes the prototype of setpwent_r.  It is zero if d_setpwent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setpwent_r is
	   defined.

       "setservent_r_proto"
	   From d_setservent_r.U:

	   This variable encodes the prototype of setservent_r.  It is zero if d_setservent_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setservent_r is
	   defined.

       "sh"
	   From sh.U:

	   This variable contains the full pathname of the shell used on this system to execute
	   Bourne shell scripts.  Usually, this will be /bin/sh, though it's possible that some
	   systems will have /bin/ksh, /bin/pdksh, /bin/ash, /bin/bash, or even something such as
	   D:/bin/sh.exe.  This unit comes before Options.U, so you can't set sh with a "-D"
	   option, though you can override this (and startsh) with "-O -Dsh=/bin/whatever
	   -Dstartsh=whatever"

       "shar"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "sharpbang"
	   From spitshell.U:

	   This variable contains the string #! if this system supports that construct.

       "shmattype"
	   From d_shmat.U:

	   This symbol contains the type of pointer returned by shmat().  It can be "void *" or
	   "char *".

       "shortsize"
	   From intsize.U:

	   This variable contains the value of the "SHORTSIZE" symbol which indicates to the C
	   program how many bytes there are in a short.

       "shrpenv"
	   From libperl.U:

	   If the user builds a shared libperl.so, then we need to tell the "perl" executable
	   where it will be able to find the installed libperl.so.  One way to do this on some
	   systems is to set the environment variable "LD_RUN_PATH" to the directory that will be
	   the final location of the shared libperl.so.  The makefile can use this with something
	   like $shrpenv $("CC") -o perl perlmain.o $libperl $libs Typical values are
	   shrpenv="env "LD_RUN_PATH"=$archlibexp/"CORE"" or shrpenv='' See the main perl Make-
	   file.SH for actual working usage.  Alternatively, we might be able to use a command
	   line option such as -R $archlibexp/"CORE" (Solaris) or -Wl,-rpath $archlibexp/"CORE"
	   (Linux).

       "shsharp"
	   From spitshell.U:

	   This variable tells further Configure units whether your sh can handle # comments.

       "sig_count"
	   From sig_name.U:

	   This variable holds a number larger than the largest valid signal number.  This is
	   usually the same as the "NSIG" macro.

       "sig_name"
	   From sig_name.U:

	   This variable holds the signal names, space separated. The leading "SIG" in signal
	   name is removed.  A "ZERO" is prepended to the list.  This is currently not used.

       "sig_name_init"
	   From sig_name.U:

	   This variable holds the signal names, enclosed in double quotes and separated by com-
	   mas, suitable for use in the "SIG_NAME" definition below.  A "ZERO" is prepended to
	   the list, and the list is terminated with a plain 0.  The leading "SIG" in signal
	   names is removed. See sig_num.

       "sig_num"
	   From sig_name.U:

	   This variable holds the signal numbers, space separated. A "ZERO" is prepended to the
	   list (corresponding to the fake "SIGZERO"), and the list is terminated with a 0.
	   Those numbers correspond to the value of the signal listed in the same place within
	   the sig_name list.

       "sig_num_init"
	   From sig_name.U:

	   This variable holds the signal numbers, enclosed in double quotes and separated by
	   commas, suitable for use in the "SIG_NUM" definition below.	A "ZERO" is prepended to
	   the list, and the list is terminated with a plain 0.

       "sig_size"
	   From sig_name.U:

	   This variable contains the number of elements of the sig_name and sig_num arrays,
	   excluding the final "NULL" entry.

       "signal_t"
	   From d_voidsig.U:

	   This variable holds the type of the signal handler (void or int).

       "sitearch"
	   From sitearch.U:

	   This variable contains the eventual value of the "SITEARCH" symbol, which is the name
	   of the private library for this package.  It may have a ~ on the front. It is up to
	   the makefile to eventually create this directory while performing installation (with ~
	   substitution).  The standard distribution will put nothing in this directory.  After
	   perl has been installed, users may install their own local architecture-dependent mod-
	   ules in this directory with MakeMaker Makefile.PL or equivalent.  See "INSTALL" for
	   details.

       "sitearchexp"
	   From sitearch.U:

	   This variable is the ~name expanded version of sitearch, so that you may use it
	   directly in Makefiles or shell scripts.

       "sitebin"
	   From sitebin.U:

	   This variable holds the name of the directory in which the user wants to put add-on
	   publicly executable files for the package in question.  It is most often a local
	   directory such as /usr/local/bin. Programs using this variable must be prepared to
	   deal with ~name substitution.  The standard distribution will put nothing in this
	   directory.  After perl has been installed, users may install their own local executa-
	   bles in this directory with MakeMaker Makefile.PL or equivalent.  See "INSTALL" for
	   details.

       "sitebinexp"
	   From sitebin.U:

	   This is the same as the sitebin variable, but is filename expanded at configuration
	   time, for use in your makefiles.

       "sitelib"
	   From sitelib.U:

	   This variable contains the eventual value of the "SITELIB" symbol, which is the name
	   of the private library for this package.  It may have a ~ on the front. It is up to
	   the makefile to eventually create this directory while performing installation (with ~
	   substitution).  The standard distribution will put nothing in this directory.  After
	   perl has been installed, users may install their own local architecture-independent
	   modules in this directory with MakeMaker Makefile.PL or equivalent.	See "INSTALL" for
	   details.

       "sitelib_stem"
	   From sitelib.U:

	   This variable is $sitelibexp with any trailing version-specific component removed.
	   The elements in inc_version_list (inc_version_list.U) can be tacked onto this variable
	   to generate a list of directories to search.

       "sitelibexp"
	   From sitelib.U:

	   This variable is the ~name expanded version of sitelib, so that you may use it
	   directly in Makefiles or shell scripts.

       "siteprefix"
	   From siteprefix.U:

	   This variable holds the full absolute path of the directory below which the user will
	   install add-on packages.  See "INSTALL" for usage and examples.

       "siteprefixexp"
	   From siteprefix.U:

	   This variable holds the full absolute path of the directory below which the user will
	   install add-on packages.  Derived from siteprefix.

       "sizesize"
	   From sizesize.U:

	   This variable contains the size of a sizetype in bytes.

       "sizetype"
	   From sizetype.U:

	   This variable defines sizetype to be something like size_t, unsigned long, or whatever
	   type is used to declare length parameters for string functions.

       "sleep"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "smail"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "so"
	   From so.U:

	   This variable holds the extension used to identify shared libraries (also known as
	   shared objects) on the system. Usually set to "so".

       "sockethdr"
	   From d_socket.U:

	   This variable has any cpp "-I" flags needed for socket support.

       "socketlib"
	   From d_socket.U:

	   This variable has the names of any libraries needed for socket support.

       "socksizetype"
	   From socksizetype.U:

	   This variable holds the type used for the size argument for various socket calls like
	   accept.  Usual values include socklen_t, size_t, and int.

       "sort"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the sort program.  After Configure runs, the value is reset to a plain "sort" and
	   is not useful.

       "spackage"
	   From package.U:

	   This variable contains the name of the package being constructed, with the first let-
	   ter uppercased, i.e. suitable for starting sentences.

       "spitshell"
	   From spitshell.U:

	   This variable contains the command necessary to spit out a runnable shell on this sys-
	   tem.  It is either cat or a grep -v for # comments.

       "srand48_r_proto"
	   From d_srand48_r.U:

	   This variable encodes the prototype of srand48_r.  It is zero if d_srand48_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_srand48_r is defined.

       "srandom_r_proto"
	   From d_srandom_r.U:

	   This variable encodes the prototype of srandom_r.  It is zero if d_srandom_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_srandom_r is defined.

       "src"
	   From src.U:

	   This variable holds the path to the package source. It is up to the Makefile to use
	   this variable and set "VPATH" accordingly to find the sources remotely.

       "ssizetype"
	   From ssizetype.U:

	   This variable defines ssizetype to be something like ssize_t, long or int.  It is used
	   by functions that return a count of bytes or an error condition.  It must be a signed
	   type.  We will pick a type such that sizeof(SSize_t) == sizeof(Size_t).

       "startperl"
	   From startperl.U:

	   This variable contains the string to put on the front of a perl script to make sure
	   (hopefully) that it runs with perl and not some shell. Of course, that leading line
	   must be followed by the classical perl idiom: eval 'exec perl -S $0 ${1+$@}' if $run-
	   ning_under_some_shell; to guarantee perl startup should the shell execute the script.
	   Note that this magic incatation is not understood by csh.

       "startsh"
	   From startsh.U:

	   This variable contains the string to put on the front of a shell script to make sure
	   (hopefully) that it runs with sh and not some other shell.

       "static_ext"
	   From Extensions.U:

	   This variable holds a list of "XS" extension files we want to link statically into the
	   package.  It is used by Makefile.

       "stdchar"
	   From stdchar.U:

	   This variable conditionally defines "STDCHAR" to be the type of char used in stdio.h.
	   It has the values "unsigned char" or "char".

       "stdio_base"
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp, to access the _base field (or
	   equivalent) of stdio.h's "FILE" structure.  This will be used to define the macro
	   FILE_base(fp).

       "stdio_bufsiz"
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp, to determine the number of
	   bytes store in the I/O buffer pointer to by the _base field (or equivalent) of
	   stdio.h's "FILE" structure.	This will be used to define the macro FILE_bufsiz(fp).

       "stdio_cnt"
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp, to access the _cnt field (or
	   equivalent) of stdio.h's "FILE" structure.  This will be used to define the macro
	   FILE_cnt(fp).

       "stdio_filbuf"
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp, to tell stdio to refill its
	   internal buffers (?).  This will be used to define the macro FILE_filbuf(fp).

       "stdio_ptr"
	   From d_stdstdio.U:

	   This variable defines how, given a "FILE" pointer, fp, to access the _ptr field (or
	   equivalent) of stdio.h's "FILE" structure.  This will be used to define the macro
	   FILE_ptr(fp).

       "stdio_stream_array"
	   From stdio_streams.U:

	   This variable tells the name of the array holding the stdio streams.  Usual values
	   include _iob, __iob, and __sF.

       "strerror_r_proto"
	   From d_strerror_r.U:

	   This variable encodes the prototype of strerror_r.  It is zero if d_strerror_r is
	   undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_strerror_r is
	   defined.

       "strings"
	   From i_string.U:

	   This variable holds the full path of the string header that will be used. Typically
	   /usr/include/string.h or /usr/include/strings.h.

       "submit"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "subversion"
	   From patchlevel.U:

	   The subversion level of this package.  The value of subversion comes from the patch-
	   level.h file.  In a version number such as 5.6.1, this is the 1.  In patchlevel.h,
	   this is referred to as "PERL_SUBVERSION".  This is unique to perl.

       "sysman"
	   From sysman.U:

	   This variable holds the place where the manual is located on this system. It is not
	   the place where the user wants to put his manual pages. Rather it is the place where
	   Configure may look to find manual for unix commands (section 1 of the manual usually).
	   See mansrc.

       t

       "tail"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "tar"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "targetarch"
	   From Cross.U:

	   If cross-compiling, this variable contains the target architecture.	If not, this will
	   be empty.

       "tbl"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "tee"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "test"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the test program.  After Configure runs, the value is reset to a plain "test" and
	   is not useful.

       "timeincl"
	   From i_time.U:

	   This variable holds the full path of the included time header(s).

       "timetype"
	   From d_time.U:

	   This variable holds the type returned by time(). It can be long, or time_t on "BSD"
	   sites (in which case <sys/types.h> should be included). Anyway, the type Time_t should
	   be used.

       "tmpnam_r_proto"
	   From d_tmpnam_r.U:

	   This variable encodes the prototype of tmpnam_r.  It is zero if d_tmpnam_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_tmpnam_r is defined.

       "to"
	   From Cross.U:

	   This variable contains the command used by Configure to copy to from the target host.
	   Useful and available only during Perl build.  The string ":" if not cross-compiling.

       "touch"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the touch program.  After Configure runs, the value is reset to a plain "touch" and
	   is not useful.

       "tr"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the tr program.  After Configure runs, the value is reset to a plain "tr" and is
	   not useful.

       "trnl"
	   From trnl.U:

	   This variable contains the value to be passed to the tr(1) command to transliterate a
	   newline.  Typical values are "\012" and "\n".  This is needed for "EBCDIC" systems
	   where newline is not necessarily "\012".

       "troff"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "ttyname_r_proto"
	   From d_ttyname_r.U:

	   This variable encodes the prototype of ttyname_r.  It is zero if d_ttyname_r is undef,
	   and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_ttyname_r is defined.

       u

       "u16size"
	   From perlxv.U:

	   This variable is the size of an U16 in bytes.

       "u16type"
	   From perlxv.U:

	   This variable contains the C type used for Perl's U16.

       "u32size"
	   From perlxv.U:

	   This variable is the size of an U32 in bytes.

       "u32type"
	   From perlxv.U:

	   This variable contains the C type used for Perl's U32.

       "u64size"
	   From perlxv.U:

	   This variable is the size of an U64 in bytes.

       "u64type"
	   From perlxv.U:

	   This variable contains the C type used for Perl's U64.

       "u8size"
	   From perlxv.U:

	   This variable is the size of an U8 in bytes.

       "u8type"
	   From perlxv.U:

	   This variable contains the C type used for Perl's U8.

       "uidformat"
	   From uidf.U:

	   This variable contains the format string used for printing a Uid_t.

       "uidsign"
	   From uidsign.U:

	   This variable contains the signedness of a uidtype.	1 for unsigned, -1 for signed.

       "uidsize"
	   From uidsize.U:

	   This variable contains the size of a uidtype in bytes.

       "uidtype"
	   From uidtype.U:

	   This variable defines Uid_t to be something like uid_t, int, ushort, or whatever type
	   is used to declare user ids in the kernel.

       "uname"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the uname program.  After Configure runs, the value is reset to a plain "uname" and
	   is not useful.

       "uniq"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the uniq program.  After Configure runs, the value is reset to a plain "uniq" and
	   is not useful.

       "uquadtype"
	   From quadtype.U:

	   This variable defines Uquad_t to be something like unsigned long, unsigned int,
	   unsigned long long, uint64_t, or whatever type is used for 64-bit integers.

       "use5005threads"
	   From usethreads.U:

	   This variable conditionally defines the USE_5005THREADS symbol, and indicates that
	   Perl should be built to use the 5.005-based threading implementation.

       "use64bitall"
	   From use64bits.U:

	   This variable conditionally defines the USE_64_BIT_ALL symbol, and indicates that
	   64-bit integer types should be used when available.	The maximal possible 64-bitness
	   is employed: LP64 or ILP64, meaning that you will be able to use more than 2 gigabytes
	   of memory.  This mode is even more binary incompatible than USE_64_BIT_INT. You may
	   not be able to run the resulting executable in a 32-bit "CPU" at all or you may need
	   at least to reboot your "OS" to 64-bit mode.

       "use64bitint"
	   From use64bits.U:

	   This variable conditionally defines the USE_64_BIT_INT symbol, and indicates that
	   64-bit integer types should be used when available.	The minimal possible 64-bitness
	   is employed, just enough to get 64-bit integers into Perl.  This may mean using for
	   example "long longs", while your memory may still be limited to 2 gigabytes.

       "usecrosscompile"
	   From Cross.U:

	   This variable conditionally defines the "USE_CROSS_COMPILE" symbol, and indicates that
	   Perl has been cross-compiled.

       "usedl"
	   From dlsrc.U:

	   This variable indicates if the system supports dynamic loading of some sort.  See also
	   dlsrc and dlobj.

       "useithreads"
	   From usethreads.U:

	   This variable conditionally defines the "USE_ITHREADS" symbol, and indicates that Perl
	   should be built to use the interpreter-based threading implementation.

       "uselargefiles"
	   From uselfs.U:

	   This variable conditionally defines the "USE_LARGE_FILES" symbol, and indicates that
	   large file interfaces should be used when available.

       "uselongdouble"
	   From uselongdbl.U:

	   This variable conditionally defines the "USE_LONG_DOUBLE" symbol, and indicates that
	   long doubles should be used when available.

       "usemorebits"
	   From usemorebits.U:

	   This variable conditionally defines the "USE_MORE_BITS" symbol, and indicates that
	   explicit 64-bit interfaces and long doubles should be used when available.

       "usemultiplicity"
	   From usemultiplicity.U:

	   This variable conditionally defines the "MULTIPLICITY" symbol, and indicates that Perl
	   should be built to use multiplicity.

       "usemymalloc"
	   From mallocsrc.U:

	   This variable contains y if the malloc that comes with this package is desired over
	   the system's version of malloc.  People often include special versions of malloc for
	   effiency, but such versions are often less portable.  See also mallocsrc and mallo-
	   cobj.  If this is "y", then -lmalloc is removed from $libs.

       "usenm"
	   From usenm.U:

	   This variable contains "true" or "false" depending whether the nm extraction is wanted
	   or not.

       "useopcode"
	   From Extensions.U:

	   This variable holds either "true" or "false" to indicate whether the Opcode extension
	   should be used.  The sole use for this currently is to allow an easy mechanism for
	   users to skip the Opcode extension from the Configure command line.

       "useperlio"
	   From useperlio.U:

	   This variable conditionally defines the "USE_PERLIO" symbol, and indicates that the
	   PerlIO abstraction should be used throughout.

       "useposix"
	   From Extensions.U:

	   This variable holds either "true" or "false" to indicate whether the "POSIX" extension
	   should be used.  The sole use for this currently is to allow an easy mechanism for
	   hints files to indicate that "POSIX" will not compile on a particular system.

       "usereentrant"
	   From usethreads.U:

	   This variable conditionally defines the "USE_REENTRANT_API" symbol, which indicates
	   that the thread code may try to use the various _r versions of library functions.
	   This is only potentially meaningful if usethreads is set and is very experimental, it
	   is not even prompted for.

       "usesfio"
	   From d_sfio.U:

	   This variable is set to true when the user agrees to use sfio.  It is set to false
	   when sfio is not available or when the user explicitely requests not to use sfio.  It
	   is here primarily so that command-line settings can override the auto-detection of
	   d_sfio without running into a "WHOA THERE".

       "useshrplib"
	   From libperl.U:

	   This variable is set to "true" if the user wishes to build a shared libperl, and
	   "false" otherwise.

       "usesocks"
	   From usesocks.U:

	   This variable conditionally defines the "USE_SOCKS" symbol, and indicates that Perl
	   should be built to use "SOCKS".

       "usethreads"
	   From usethreads.U:

	   This variable conditionally defines the "USE_THREADS" symbol, and indicates that Perl
	   should be built to use threads.

       "usevendorprefix"
	   From vendorprefix.U:

	   This variable tells whether the vendorprefix and consequently other vendor* paths are
	   in use.

       "usevfork"
	   From d_vfork.U:

	   This variable is set to true when the user accepts to use vfork.  It is set to false
	   when no vfork is available or when the user explicitely requests not to use vfork.

       "usrinc"
	   From usrinc.U:

	   This variable holds the path of the include files, which is usually /usr/include. It
	   is mainly used by other Configure units.

       "uuname"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "uvXUformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "UV" as an unsigned
	   hexadecimal integer in uppercase "ABCDEF".

       "uvoformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "UV" as an unsigned
	   octal integer.

       "uvsize"
	   From perlxv.U:

	   This variable is the size of a "UV" in bytes.

       "uvtype"
	   From perlxv.U:

	   This variable contains the C type used for Perl's "UV".

       "uvuformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "UV" as an unsigned
	   decimal integer.

       "uvxformat"
	   From perlxvf.U:

	   This variable contains the format string used for printing a Perl "UV" as an unsigned
	   hexadecimal integer in lowercase abcdef.

       v

       "vendorarch"
	   From vendorarch.U:

	   This variable contains the value of the "PERL_VENDORARCH" symbol.  It may have a ~ on
	   the front.  The standard distribution will put nothing in this directory.  Vendors who
	   distribute perl may wish to place their own architecture-dependent modules and exten-
	   sions in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent.
	   See "INSTALL" for details.

       "vendorarchexp"
	   From vendorarch.U:

	   This variable is the ~name expanded version of vendorarch, so that you may use it
	   directly in Makefiles or shell scripts.

       "vendorbin"
	   From vendorbin.U:

	   This variable contains the eventual value of the "VENDORBIN" symbol.  It may have a ~
	   on the front.  The standard distribution will put nothing in this directory.  Vendors
	   who distribute perl may wish to place additional binaries in this directory with Make-
	   Maker Makefile.PL "INSTALLDIRS"=vendor or equivalent.  See "INSTALL" for details.

       "vendorbinexp"
	   From vendorbin.U:

	   This variable is the ~name expanded version of vendorbin, so that you may use it
	   directly in Makefiles or shell scripts.

       "vendorlib"
	   From vendorlib.U:

	   This variable contains the eventual value of the "VENDORLIB" symbol, which is the name
	   of the private library for this package.  The standard distribution will put nothing
	   in this directory.  Vendors who distribute perl may wish to place their own modules in
	   this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent.  See
	   "INSTALL" for details.

       "vendorlib_stem"
	   From vendorlib.U:

	   This variable is $vendorlibexp with any trailing version-specific component removed.
	   The elements in inc_version_list (inc_version_list.U) can be tacked onto this variable
	   to generate a list of directories to search.

       "vendorlibexp"
	   From vendorlib.U:

	   This variable is the ~name expanded version of vendorlib, so that you may use it
	   directly in Makefiles or shell scripts.

       "vendorprefix"
	   From vendorprefix.U:

	   This variable holds the full absolute path of the directory below which the vendor
	   will install add-on packages.  See "INSTALL" for usage and examples.

       "vendorprefixexp"
	   From vendorprefix.U:

	   This variable holds the full absolute path of the directory below which the vendor
	   will install add-on packages.  Derived from vendorprefix.

       "version"
	   From patchlevel.U:

	   The full version number of this package, such as 5.6.1 (or 5_6_1).  This combines
	   revision, patchlevel, and subversion to get the full version number, including any
	   possible subversions.  This is suitable for use as a directory name, and hence is
	   filesystem dependent.

       "version_patchlevel_string"
	   From patchlevel.U:

	   This is a string combining version, subversion and perl_patchlevel (if perl_patchlevel
	   is non-zero).  It is typically something like 'version 7 subversion 1'  or 'version 7
	   subversion 1 patchlevel 11224' It is computed here to avoid duplication of code in
	   myconfig.SH and lib/Config.pm.

       "versiononly"
	   From versiononly.U:

	   If set, this symbol indicates that only the version-specific components of a perl
	   installation should be installed.  This may be useful for making a test installation
	   of a new version without disturbing the existing installation.  Setting versiononly is
	   equivalent to setting installperl's -v option.  In particular, the non-versioned
	   scripts and programs such as a2p, c2ph, h2xs, pod2*, and perldoc are not installed
	   (see "INSTALL" for a more complete list).  Nor are the man pages installed.	Usually,
	   this is undef.

       "vi"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "voidflags"
	   From voidflags.U:

	   This variable contains the eventual value of the "VOIDFLAGS" symbol, which indicates
	   how much support of the void type is given by this compiler.  See "VOIDFLAGS" for more
	   info.

       x

       "xlibpth"
	   From libpth.U:

	   This variable holds extra path (space-separated) used to find libraries on this plat-
	   form, for example "CPU"-specific libraries (on multi-"CPU" platforms) may be listed
	   here.

       "xs_apiversion"
	   From xs_apiversion.U:

	   This variable contains the version of the oldest perl binary compatible with the
	   present perl.  perl.c:incpush() and lib/lib.pm will automatically search in $sitearch
	   for older directories across major versions back to xs_apiversion.  This is only use-
	   ful if you have a perl library directory tree structured like the default one.  See
	   "INSTALL" for how this works.  The versioned site_perl directory was introduced in
	   5.005, so that is the lowest possible value.  Since this can depend on compile time
	   options it is set by Configure.  Other non-default sources of potential incompatibil-
	   ity, such as multiplicity, threads, debugging, 64bits, sfio, etc., are not checked for
	   currently, though in principle we could go snooping around in old Config.pm files.

       y

       "yacc"
	   From yacc.U:

	   This variable holds the name of the compiler compiler we want to use in the Makefile.
	   It can be yacc, byacc, or bison -y.

       "yaccflags"
	   From yacc.U:

	   This variable contains any additional yacc flags desired by the user.  It is up to the
	   Makefile to use this.

       z

       "zcat"
	   From Loc.U:

	   This variable is defined but not used by Configure.	The value is a plain '' and is
	   not useful.

       "zip"
	   From Loc.U:

	   This variable is used internally by Configure to determine the full pathname (if any)
	   of the zip program.	After Configure runs, the value is reset to a plain "zip" and is
	   not useful.

NOTE
       This module contains a good example of how to use tie to implement a cache and an example
       of how to make a tied variable readonly to those outside of it.

perl v5.8.0				    2002-06-01				      Config(3pm)


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