Install Mac OS X 10.6 SDK on newer Xcode. GitHub Gist: instantly share code, notes, and snippets. Xcode 4.2 should work fine on your machine. I have a snowleopard machine at office running Xcode 4.2, i updated it via the Mac App store only. If this is not working via Mac App store, then go to your developer account (free or paid) and then download the Xcode version for Snow Leopard and install it.
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