This is part of the Installation and Testing on OS X guide for installing and running FreeSWITCH™. This page describes the installation of components that may be unique to OS X 10.11.
OS X Developer Tools
The OS X Developer Tools are composed of two parts, the Xcode 7 OS X Software Developer Kit used to develop and test OS X GUI applications, and the Command Line Tools that provide LLVM, Clang, Git and other tools required to generate non-GUI applications such as FreeSWITCH™ and its prerequisites. The Command Line Tools are included and automatically installed with Xcode. The Apple Developer site offers the standalone CLT but it cannot be used because Homebrew will not install without the Xcode/CLT version.
Install Xcode using the OS X App Store application or download it from the OS X Developer site which requires a minimum of a free membership. Xcode takes a while to download and is placed into the Applications folder (/Applications directory) with the CLT in /Applications/Xcode.app/Contents/Developer. Once installed start Xcode to accept the license agreement.