CVS head broken on win32?

I'm trying to compile CVS HEAD on Win32.

./configure --enable-integer-datetimes
make
...
It ends with:

postmaster/SUBSYS.o(.text+0x9d7):fork_process.c: undefined reference to 
`fork'

gcc --version and uname -a
gcc.exe (GCC) 3.4.1 (mingw special)
MINGW32_NT-5.1 THHALHOME3 1.0.11(0.46/3/2) 2004-03-30 07:29 i686 unknown

Regards,
Thomas Hallgren