~$ brew cleanup hhvm
~$ brew install https://github.com/hhvm/homebrew-hhvm/raw/master/hhvm.rb
######################################################################## 100.0%
==> Installing dependencies for hhvm: llvm, dwarfutils, libelf, boost, gflags, glog, imagemag
==> Installing hhvm dependency: llvm
==> Downloading http://llvm.org/releases/3.6.2/llvm-3.6.2.src.tar.xz