Q. What is needed for Mac OS X support in Coldest?
A. There are a couple of options here. I do not own a Mac and it is unlikely that I will be purchasing one for the foreseeable future. If someone wants to send me one, I would be perfectly happy to do a Mac port myself.
Alternatively, someone who already has a Mac and a bit of programming knowledge could do the port. The game is already written with cross platform compatibility in mind, and given the similarities between the BSD core of Mac OS X and Linux I would not expect it to be difficult to get working on a Mac. It may even compile fine right now with the proper development environment.