TBH I failed to build bitcoin on windows, I do not have a MAC, and it all works flawlessly. However you should IMHO set bitcoin apart from the BSD and Other, and instead insert some Unix and other option.

For example, I have a pal who is working on porting the bitcoin client to Solaris on an Ultrasparc3 Sunfire. I guess he would be affronted by being pushed into the Linux, BSD and other category