- OS X 10.10 or later (releases for earlier operating systems can be found in Related Links)
- Apple's Xcode Developer Tools:
- Version 6.0.1 or later for OS X 10.10 Yosemite
- Version 5.0.1 or later for OS X 10.9 Mavericks
- Version 4.4 or later for OS X 10.8 Mountain Lion
- Version 4.1 or later for OS X 10.7 Lion
- Version 3.2 or later for OS X 10.6 Snow Leopard
- Version 3.1 or later for OS X 10.5 Leopard
- Apple's Command Line Developer Tools
- (Optional) The X11 windowing environment for ports that depend on the functionality it provides to run.