Update: For Haskell Platform 2012.2.0.0 I decided that the best course of action was to ship it with a hand modified settings file: I made both gcc and ar point at /usr/bin. Turns out that with 10.7 you can install just the "Command Line Tools for Xcode" from Apple's Developer site... *without installing Xcode*.
If a user installed Xcode 4.3, then they have the tools, but just not in the normal place. Within Xcode 4.3, you can go to preferecences, and the download panel, and you get the option to download and install the command line tools, which will, honestly, download a second code and install those in /usr/bin (and /usr/include, etc...) For older Xcode's the user has to have chosen the "command line tools" or "unix development tools" options from the Xcode installer. - Mark
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