How to make games cross platform?

Miscellaneous Forums/General Discussion/How to make games cross platform?

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Greetings,

I would like to know how exactly i can make my game cross platform?
Do i just get a mac + linux on virtual machine, compile my code with these versions of BlitzMax, and thats it?
Or do i need to add all kinds of fancy stuff?

Im currently only using Max2D DX7 and OpenGL drivers for Max2D.