title: How do I upgrade the clang on my Mac running OS/X El Capitan to LLVM 3.8?
body: <p>I downloaded the Mac binary version of llvm-3.8 from llvm.org but am uncertain how to install it to replace the existing version of clang that shipped with the machine.  I want to upgrade because I need support for the OpenMP library which is included in the latest version.</p>