As the README at that repository states, For 10.7 and later Apple now distributes a "Command Line Tools" package on the developer site. When I build and release the Haskell Platform, I confirm that works when just this package is installed (rather than all of Xcode).
The Command Line Tools from Apple include not only the compiler and bin tools that GHC needs, but also the full suite of development headers and library stubs. Many people's OS X woes with HP have stemmed from non-standard development installations. If at all possible, I suggest you stick with Apple's distributions. Please keep us appraised of how it works for you after you've used it for a bit. I'm curious if, should you start installing some of Hackage's more complicated packages, if it continues to work out. - Mark (HP release manager)
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