The B3D loader example.

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Works fine for me.

BlitzMax seems to require XCode (and not some previous version of the developer tools) to be installed. I don't know if XCode can be installed under 10.2 (it certainly requires a fairly up-to-date 10.2 if it can).

You should try 10.3.6 and XCode 1.5 if you can. (XCode is free from developer.apple.com.)

OSX is OpenGL all the way. If it boots, you have OpenGL. But that said, if your graphics card hasn't much memory, BlitzMax may kill it -- even the 2D graphics require significant video memory I believe.