The gimp-gap frontend code for xanim and the mpeg_encoders 
requires UNIX Environment. It would not run on WINDOWS 
even if compile would be successful. 
  
I'll change the Code and Makefiles in a way that those 
parts will not be compiled on WINDOWS any longer, 
with the hope that the other parts of gimp-gap 
will be built properly on WINDOWS.
(I can't verify, my Development Environment is LINUX only) 

I added the configure option --disable-unix-frontends
that should be used for WIN32 builds.
(call autogen.sh --disable-unix-frontends)

I also changed gap_decode_xanim.c to use the WIN32 variante of mkdir.
It should at least compile on windows even with unix-frontends 
enabled. This is untested, my development system is linux only,
but should be working with CVS version 2003.09.16
(The unix-frontends are useless on Windows and will not run)

Please let me know about the gimp-gap build on Windows, even if
it works fine.

I used autogen.sh -C --disable-audiosupport --disable-unix-frontends
and got the following:

make[2]: Entering directory `/c/usr/compile/gimp-gap-cvs/libwavplayclient'
if gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. 
-I/c/temp/gimp1.3/include/gimp-1.3 -Ic:/usr/src/include/gtk-2.0
-Ic:/usr/src/lib/gtk-2.0/include -Ic:/usr/src/include/atk-1.0
-Ic:/usr/src/include/pango-1.0 -Ic:/usr/src/include/glib-2.0
-Ic:/usr/src/lib/glib-2.0/include -I/usr/local/include 
-Ic:/usr/src/include -DG_DISABLE_DEPRECATED -DGDK_DISABLE_DEPRECATED 
-Ic:/usr/src/include -Wall -MT wpc_client.o -MD -MP -MF
".deps/wpc_client.Tpo" \
  -c -o wpc_client.o `test -f 'wpc_client.c' || echo './'`wpc_client.c; \
then mv ".deps/wpc_client.Tpo" ".deps/wpc_client.Po"; \
else rm -f ".deps/wpc_client.Tpo"; exit 1; \
fi
In file included from wpc_client.c:3:
client.c:56:21: sys/ipc.h: No such file or directory
client.c:57:21: sys/msg.h: No such file or directory
client.c:58:22: sys/wait.h: No such file or directory
client.c:61:29: linux/soundcard.h: No such file or directory
In file included from client.c:65,
                 from wpc_client.c:3:
wavplay.h:64:21: sys/ipc.h: No such file or directory
In file included from wavplay.h:84,
                 from client.c:65,
                 from wpc_client.c:3:
wavfile.h:43: parse error before "u_long"
wavfile.h:44: parse error before "u_long"
In file included from client.c:65,
                 from wpc_client.c:3:
wavplay.h:219: parse error before "key_t"
wavplay.h:219: warning: no semicolon at end of struct or union
wavplay.h:232: parse error before '}' token
wavplay.h:232: warning: type defaults to `int' in declaration of
`WavPlayOpts'
wavplay.h:232: warning: data definition has no type or storage class
wavplay.h:497: parse error before "LockIPCKey"
wavplay.h:503: parse error before "WavPlayOpts"
wavplay.h:511: parse error before '*' token
wavplay.h:512: parse error before '*' token
wavplay.h:513: parse error before '*' token
In file included from wpc_client.c:3:
client.c: In function `close_msgq':
client.c:98: warning: implicit declaration of function `kill'
client.c:107: warning: implicit declaration of function `waitpid'
client.c:107: `WNOHANG' undeclared (first use in this function)
client.c:107: (Each undeclared identifier is reported only once
client.c:107: for each function it appears in.)
client.c:112: warning: implicit declaration of function `sleep'
client.c: In function `tosvr_start':
client.c:151: warning: implicit declaration of function `fork'
client.c:176: `IPC_NOWAIT' undeclared (first use in this function)
client.c:185: `WNOHANG' undeclared (first use in this function)
make[2]: *** [wpc_client.o] Error 1
make[2]: Leaving directory `/c/usr/compile/gimp-gap-cvs/libwavplayclient'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/c/usr/compile/gimp-gap-cvs'
make: *** [all] Error 2

This change I just commited should fix it:

2003-09-22  Sven Neumann  <sven@gimp.org>

  * configure.in: redone the checks for audio support and build of
  unix frontends. Moved the output to the end and introduced
  automake conditionals.

  * gap/Makefile.am
  * gap/gap_player_dialog.c: changed accordingly.

  * Makefile.am: build the libwavclient directory conditionally.

  * gap/gap_navigator_dialog.c (run): cannot use kill() on WIN32.

--disable-audiosupport should have been --disable-audio-support ;)

Builds now and seems to work. Will open new reports for further bugs,
if any.