Building php4 for Windows using Cygwin's gcc

Hi, the docs are talking related to building php4 for Windows only about Microsoft Visual C++. Unfortunately I didn't own this software since I'm a Unix-man and this is a short test under Windows but I need php4 with the pgsql-extention and there are no prebuild binaries with this extention. So I tried to build it the same way as on my Linux-box: open a Cygwin-bash, typing configure, then typing make. I expected gcc to do it for me and indeed gcc will do something. But then it stops in php4/ext/standard in the file datetime.c with "wrong type argument to unary minus" in line 186, "invalid operands to binary /" in line 429, 487 and "invalid operands to binary %" in line 429, 487. I used php-4.0.4pl1 and php-4.0.6. Does this say anything to anyone of you? Thanks, Wolfgang