[greg@greg-desktop ffi]$ make
i486-mingw32-gcc -g -Wall -I.   -c -o ffi.o ffi.c
ffi.c: In function 'ffi_closure_SYSV_inner':
ffi.c:386:1: warning: visibility attribute not supported in this configuration; ignored [-Wattributes]
i486-mingw32-gcc  -o libffi.a ffi.o
ffi.o: In function `ffi_call':
/home/greg/ffi/ffi.c:302: undefined reference to `_ffi_call_SYSV'
ffi.o: In function `ffi_prep_closure_loc':
/home/greg/ffi/ffi.c:524: undefined reference to `_ffi_closure_SYSV'
ffi.o: In function `ffi_prep_raw_closure_loc':
/home/greg/ffi/ffi.c:578: undefined reference to `_ffi_closure_raw_SYSV'
ffi.o: In function `ffi_raw_call':
/home/greg/ffi/ffi.c:630: undefined reference to `_ffi_call_SYSV'
/usr/lib/gcc/i486-mingw32/4.6.1/../../../../i486-mingw32/lib/libmingw32.a(main.o):(.text+0xf3): undefined reference to `_WinMain@16'
collect2: ld returned 1 exit status
make: *** [libffi.a] Error 1