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Man, you should take a look at what the guys from xreal [http://xreal-project.net] have done to update the ioquake3 code and continue from there or from ioquake3 itself [http://ioquake3.org]. (the xreal svn seems a bit messy right now, but their code works)
And try not to mess up the multiplatform code with windows specific hacks please, otherwise, i see no need for this new game engine at all.
Good luck with this project.