I having a problem installing this software.

when I run make i get the following errors on hpux11.11

make
No suffix list.
make all-recursive
No suffix list.
Making all in src
No suffix list.
source='sudosh.c' object='sudosh.o' libtool=no \
depfile='.deps/sudosh.Po' tmpdepfile='.deps/sudosh.TPo' \
depmode=hp /bin/sh ../depcomp \
cc -DHAVE_CONFIG_H -I. -I. -I.. -g -c sudosh.c
(Bundled) cc: warning 480: The -g option is available only with the C/ANSI C product; ignored.
(Bundled) cc: "sudosh.c", line 87: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 88: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 89: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 90: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 91: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 92: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 93: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 94: error 1000: Unexpected symbol: "len".
(Bundled) cc: "sudosh.c", line 94: error 1506: Parameters allowed in function definition only.
(Bundled) cc: "sudosh.c", line 95: error 1000: Unexpected symbol: "size_t".
(Bundled) cc: "sudosh.c", line 95: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 95: error 1573: Type of "size_t" is undefined due to an illegal declaration.
(Bundled) cc: "sudosh.c", line 97: error 1000: Unexpected symbol: "*".
(Bundled) cc: "sudosh.c", line 97: error 1584: Inconsistent type declaration: "config".
(Bundled) cc: "sudosh.c", line 97: error 1713: Illegal redeclaration for identifier "config".
(Bundled) cc: "sudosh.c", line 98: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 100: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 101: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 102: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 108: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 492: warning 563: Argument #3 is not the correct type.
(Bundled) cc: "sudosh.c", line 493: warning 563: Argument #3 is not the correct type.
(Bundled) cc: "sudosh.c", line 497: warning 563: Argument #3 is not the correct type.
(Bundled) cc: "sudosh.c", line 506: warning 563: Argument #3 is not the correct type.
(Bundled) cc: "sudosh.c", line 526: warning 563: Argument #3 is not the correct type.
(Bundled) cc: "sudosh.c", line 533: warning 563: Argument #3 is not the correct type.
(Bundled) cc: "sudosh.c", line 544: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 594: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 599: error 1716: Automatic aggregate initialization is an ANSI feature.
(Bundled) cc: "sudosh.c", line 662: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 692: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 708: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 723: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 737: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 786: error 1000: Unexpected symbol: "size_t".
(Bundled) cc: "sudosh.c", line 786: error 1705: Function prototypes are an ANSI feature.
(Bundled) cc: "sudosh.c", line 786: error 1573: Type of "size" is undefined due to an illegal declaration.
*** Error exit code 1

Stop.
*** Error exit code 1

Stop.
*** Error exit code 1

Stop.

HPUX by default comes with a seriously handicapped compiler. It does not support ANSI C 89, just K & R C.

Is sudosh from the guys at sage.org or is it from sourceforge?

There are workarounds:
See if there is a HPUX binary out there somewhere
Upgrade your C compiler