How do I cross-compile C code on Windows for a binary to also be run on Unix (Solaris/HPUX/Linux)?

Question

I been looking into Cygwin/Mingw/lcc and I liked to be able to compile perl native C extensions on my windows(preferably under cygwin) and then run them on Solaris and HP un

Answer 1

This can't be done ... but is it that much of a hassle to recompile the code under Solaris or HP?