Mac_OS_X

Due to the highly proprietary nature of Mac, this platform is difficult
to develop for, although many aspects of it remain the same as on the
preferred platform of Linux, so development usually
doesn't lag much, as the primary developers use Linux primarily.
Dependencies are low for simply checking
out, but higher for compiling games. The API
Libraries are pretty much the standard open
source ones that you see in Linux. ENIGMA itself takes the form of
DYLIB (Dynamic Library) for calling as a library (e.g.
from LateralGM), or JAR for command line
usage.

Dependencies

You need to obtain the Mac or iPhone SDK. The obvious way to do this is
to register with apple and download it from their developer
website.
Usually it comes packaged with XCode - which also means that if you
already have XCode installed, you probably also already have the SDK
installed.

API Libraries