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inc::latest(3)		       User Contributed Perl Documentation		   inc::latest(3)

       inc::latest - use modules bundled in inc/ if they are newer than installed ones

	 # in Build.PL
	 use inc::latest 'Module::Build';

       The "inc::latest" module helps bootstrap configure-time dependencies for CPAN
       distributions.  These dependencies get bundled into the "inc" directory within a
       distribution and are used by Build.PL (or Makefile.PL).

       Arguments to "inc::latest" are module names that are checked against both the current @INC
       array and against specially-named directories in "inc".	If the bundled version is newer
       than the installed one (or the module isn't installed, then, the bundled directory is
       added to the start of <@INC> and the module is loaded from there.

       There are actually two variations of "inc::latest" -- one for authors and one for the
       "inc" directory.  For distribution authors, the "inc::latest" installed in the system will
       record modules loaded via "inc::latest" and can be used to create the bundled files in
       "inc", including writing the second variation as "inc/latest.pm".

       This second "inc::latest" is the one that is loaded in a distribution being installed
       (e.g. from Build.PL).  This bundled "inc::latest" is the one that determines which module
       to load.

   Special notes on bundling
       The "inc::latest" module creates bundled directories based on the packlist file of an
       installed distribution.	Even though "inc::latest" takes module name arguments, it is
       better to think of it as bundling and making available entire distributions.  When a
       module is loaded through "inc::latest", it looks in all bundled distributions in "inc/"
       for a newer module than can be found in the existing @INC array.

       Thus, the module-name provided should usually be the "top-level" module name of a
       distribution, though this is not strictly required.  For example, Module::Build has a
       number of heuristics to map module names to packlists, allowing users to do things like

	 use inc::latest 'Devel::AssertOS::Unix';

       even though Devel::AssertOS::Unix is contained within the Devel-CheckOS distribution.

       At the current time, packlists are required.  Thus, bundling dual-core modules may require
       a 'forced install' over versions in the latest version of perl in order to create the
       necessary packlist for bundling.

       When calling "use", the bundled "inc::latest" takes a single module name and optional
       arguments to pass to that module's own import method.

	 use 'inc::latest' 'Foo::Bar' qw/foo bar baz/;

       You are in author-mode inc::latest if any of the Author-mode methods are available.  For

	 if ( inc::latest->can('write') ) {

	     my @list = inc::latest->loaded_modules;

	   This takes no arguments and always returns a list of module names requested for
	   loading via "use inc::latest 'MODULE'", regardless of whether the load was successful
	   or not.

	     inc::latest->write( 'inc' );

	   This writes the bundled version of inc::latest to the directory name given as an
	   argument.  It almost all cases, it should be '"inc"'.

	     for my $mod ( inc::latest->loaded_modules ) {
	       inc::latest->bundle_module($mod, $dir);

	   If $mod corresponds to a packlist, then this function creates a specially-named
	   directory in $dir and copies all .pm files from the modlist to the new directory
	   (which almost always should just be 'inc').	For example, if Foo::Bar is the name of
	   the module, and $dir is 'inc', then the directory would be 'inc/inc_Foo-Bar' and
	   contain files like this:


	   Currently, $mod must have a packlist.  If this is not the case (e.g. for a dual-core
	   module), then the bundling will fail.  You may be able to create a packlist by forced
	   installing the module on top of the version that came with core Perl.

   As bundled in inc/
       All methods are private.  Only the "import" method is public.

       Eric Wilhelm <ewilhelm@cpan.org>, David Golden <dagolden@cpan.org>

       Copyright (c) 2009 by Eric Wilhelm and David Golden

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.


perl v5.16.3				    2014-06-10				   inc::latest(3)
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