small note to point out that as of current git repo, MAME requires Xcode 7.x (and thus OSX >= 10.10.4) to compile on OSX due to some flags which are set by BGFX library which are not recognized by older clang.

not a big deal since update to 10.11 is free, but still worth a not for whoever is stuck for any reason to 10.10.3 (as I am for another couple of weeks)