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Apparently Steam will make the 3 party games for mac but not the older ones as of its low graphics and its compatibility (windows 95/98)
so that rules out Oddworld...
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You might want to rethink that..if they're gonna port to mac/linux that means they have all the game source etc so they CAN port it.
If the game is older / 2D then it should be easier cause you dont need a graphics card, all the drawing can be done in software on the CPU since people have fast CPUs these days.
Porting a 3D newer game would be much much harder since you'd need to port DirectX to OpenGL and convert all the shaders and so on.
Also from seeing how the 2D oddworld games work it should just be a case of replacing the C PS1 emulator code with a version that uses a software rendering engine (SDL would be an easy choice!).