Translations:Compile on MacOS/76/en

Package Manager
You will want to use a package manager to install prerequisite software, this page gives instructions for two of the common package managers in use for OS X: Homebrew and MacPorts. It's easiest to pick one package manager for your system, and not have multiple package managers installed concurrently. Currently (October 2015), Homebrew has more up-to-date libraries relating to FreeCAD than MacPorts.