Hi Carter, Thank you for your information. That is really helpful. I wrote a blog article on "Building GHC head on Mavericks with Xcode 5": http://d.hatena.ne.jp/kazu-yamamoto/20131028/1382921924 --Kazu
Darin Morrison has a brew tap https://github.com/darinmorrison/homebrew-haskell that works, alternatively, have a build of a more recent GCC locally (i have gcc 4.8 installed )
alternatively, manuel, Luke i, and darin hacked out a way to wrap clang so 7.6 could use clang as if it were gcc. the current version lives over https://github.com/ghc-ios/ghc-ios-scripts/blob/master/clang-xcode5-wrapper...., as linked from the ghcIOS directions here http://ghc.haskell.org/trac/ghc/wiki/Building/CrossCompiling/iOS
the simplest way might be the last in terms of extra deps to install.
alternatively you can do something like brew install gcc48 or brew install apple-gcc42 (i've got 4.8 installed)
cheers