Quote Originally Posted by UngratefulNinja
not like its that hard really, all OSX is a POSIX/UNIX with a really well developed X11 variant GUI.
Specifically, OS-X was built on top of Darwin, which is Apple's own POSIX Operating System - and open source, which is fantastic. Darwin's kernel is a Xnu, which is a hybrid based on the Mach 3.0 and FreeBSD 5.x kernels. The fact that almost everything in OS-X's family tree is open source apart from OS-X itself, means that most of it will run on x86 - and if it doesn't, then some geek somewhere will be able to make it.

Open source is definitely the way forward.