The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system. To that end we provide the command-line driven MacPorts software package under a BSD License, and through it easy access to thousands of ports that greatly simplify the task of compiling and installing open-source software on your Mac.

Requirements:
OS X 10.8+
Also available:
Version 2.1.3 for OS X 10.7
Version 2.1.3 for OS X 10.6
Version 2.1.3 for OS X 10.5
Version 1.9.1 for OS X 10.4

Please note that in order to install and run MacPorts on Mac OS X, your system must have installations of the following components:
• Apple's Xcode Developer Tools (version 4.1 or later for Lion, 3.2 or later for Snow Leopard, or 3.1 or later for Leopard), found at the Apple Developer Connection site, on your Mac OS X installation CDs/DVD, or in the Mac App Store. Using the latest available version that will run on your OS is highly recommended. Ensure that the optional components for command line development are installed ("UNIX Development", plus "System Tools" in newer versions, or "Command Line Support" in older ones).
• The X11 windowing environment (A.K.A. “X11 User”) for ports that depend on the functionality it provides to run.
The “X11 User” package is an optional installation on your system CDs/DVD for Tiger, enabled through the “Customize” button of the installer, whereas it is included by default on Leopard and newer.
You can use the xorg-server port instead of Apple's X11.app if you wish.

Intel Required