The Pascal parts ought work, if you have a compiler for the same pascal dialect.
You'd also need the MacApp framework, which I don't think was ever ported to OSX.
Well I'll be damned; after some more research, it looks like it WAS ported (unofficially) to OSX. That said, I'm not sure it works with the original language anymore.
there are some Mac OS 8 and 9 images around; probably you'd have more luck trying to compile it under a VM booting one of those