Our Mac maintainer seems to have fled his country, so I really don't know how ENIGMA is doing on Mac. We've tried to coordinate with him, but have just recently begun moving on as interest in the platform is very low. We'd be happy to walk you through trying to get it up and running again, but I can't promise anything at this point.
It's my understanding you'll need Apple's developer tools, along with a copy of ENIGMA's repository. If you're feeling jumpy, you can try to see how it's installed on Linux from the
Wiki Git installation page. Otherwise, just check out from git, run install.py, and then run LateralGM's jar file, probably using [snip]java -jar lgm16b4.jar[/snip] in your terminal window.
Let me know how far that gets you.
Cheers