I'd like to remind you that there's openage, a free engine for Age of Empires 2. https://github.com/SFTtech/openage It will be the future if you wanna accomplish things the original engine is incapable of doing, especially a sane mod API. Help us make it more awesome :)
Does anyone have an OS X build of this?
It appears you can build here
https://github.com/SFTtech/openage/blob/master/doc/building....