Homebrew/homebrew — pull request #29084 by glehmann (2014-05-09 12:57:42+00:00)
Title: ghc 7.8.2 with --devel

ghc 7.8 uses clang internally. clang is used to build the ghc 7.8 on mavericks
64 bit, and gcc is used on older OS and 32 bit builds. Also advise to use
cabal-install in the caveat.