Yah install XCode first then BlitzMax, then syncmods, then rebuild modules, then exit and restart.
You don't actually need ALL of the xcode package in order for BlitzMax to work, it boils down to a few hundred K that you actually need, but you might as well install it all.
As you probably know Mac's are OpenGL only, no DirectX, and they pretty much all come with it built in. Your new iMac probably has at least OpenGL 2 already.
There's not much else you need to be aware of, Blitz is the same as on the other platforms more or less. Just make sure you use Little or Big-endian streams if you write/read data.
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