mxcl/homebrew — pull request #11708 by rhysd (2012-04-17 18:05:14+00:00)
Title: GHC 64 bit version

GHC for 64 bit MacOS X was experimental.
But now it is officially released.
http://www.haskell.org/ghc/download_ghc_7_0_4#macosx_x86_64
http://www.haskell.org/ghc/download_ghc_7_4_1#macosx_x86_64

I remove --64bit option and change to building 64 bit version as default.