compile error - GNU/Linux - "S_IFMT" undeclared

Hi,

I just tried to update Gwydion Dylan from SVN on my Gentoo Linux box and 
got this:

----------------------------------------------------
gcc -Wall -Wno-unused-variable -I.  -O2 -fno-strict-aliasing -
D_POSIX_C_SOURCE -I/var/tmp/portage/dev-lang/gwydion-dylan-2.4.99/work/
src/d2c/runtime -I/var/tmp/portage/dev-lang/gwydion-dylan-2.4.99/work/src 
-DGD_PLATFORM_LINUX -D_POSIX_C_SOURCE  -I/var/tmp/portage/dev-lang/
gwydion-dylan-2.4.99/work/src/common/io -c /var/tmp/portage/dev-lang/
gwydion-dylan-2.4.99/work/src/common/io/unix-portability.c -o unix-
portability.o
/var/tmp/portage/dev-lang/gwydion-dylan-2.4.99/work/src/common/io/unix-
portability.c: In function 'io_fd_info':
/var/tmp/portage/dev-lang/gwydion-dylan-2.4.99/work/src/common/io/unix-
portability.c:17: error: 'S_IFMT' undeclared (first use in this function)
/var/tmp/portage/dev-lang/gwydion-dylan-2.4.99/work/src/common/io/unix-
portability.c:17: error: (Each undeclared identifier is reported only once
/var/tmp/portage/dev-lang/gwydion-dylan-2.4.99/work/src/common/io/unix-
portability.c:17: error: for each function it appears in.)
/var/tmp/portage/dev-lang/gwydion-dylan-2.4.99/work/src/common/io/unix-
portability.c:17: error: 'S_IFREG' undeclared (first use in this function)
make: *** [unix-portability.o] Error 1
----------------------------------------------------

If I add 
  #define _XOPEN_SOURCE 500
to the beginning of "portability.c", it works. 

Though: I tried whether it compiles in a standalone C test program and 
there it works fine even without the "#define". Weird...

"gcc -E -dD" log is:
<http://www.scratchpost.org/patches/dylan_compile_gcc_-E_-dD_log>

cheers,
   Danny

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