Thanks for the answer.
As I've understood from what I've read on the given sites, there is some software that helps porting programs written for UNIX-like systems to Mac.
But I don't owe a Mac, (and am not even willing to...

), so I can't try that out, but if I understand - the software contains tools for building programs that use GNU build system, am I right?
My project is a game that doesn't use any GUI libraries.
It uses only SDL and OpenGL, so im pretty sure that the code should be compatible with Mac (however there may be some problems with OpenGL API - it is a bit different under linux and under windows for example).
And maby there are some people who would like to help me in creating Mac binaries of my program? :wink:
It's GPL'd of course