How does it manage the stack? The basic 6502's 256 bytes in page 1 isn't much. Presumably it manages an additional psuedo 16 bit stack ptr.
I managed to compile my favourite text editor to fit on a PDP/11 which has 16 bit pointers.

I would have thought pascal would have been more common back then, and there are pascal to C convertors.

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The original poster did not indicate which high level language. For C and Pascal, the 6502 hardware stack limitation is an issue and limits recursion, but for Forth, say, there is no real problem since the data and return stacks are separate. (The same "trick" could be built into a 6502 C compiler of course.)

On the other hand, maybe the original question implies a desire to program 6502 assembly on a mac? That's certainly possible as well - I think I'd use OrgASM (try searching for that! 8-o ) and MPW.

Ken