[venomsnake]

According to John Carmack its a few weeks worth to port, and maybe even less to extend wine.

But that is like saying that according to Superman going to the moon is a few minutes of flight.

[munchor]

And while Superman might be a hell of a Super Hero, what he said doesn't mean much. Its heavily dependent on libraries/frameworks/engines and technologies used to make the game.

If you use something like C++ and SDL it shouldn't be too hard (if not automatic), but if you use something like C#/XNA it could be harder (if not impossible?), but anyway I think (hope) most C# game developers and ex-XNA users use MonoGame these days.