What about installing GCC instead of/in addition to Clang? As far as I know we don't support building DMD with Clang yet.
If only the command line developer tools are installed, will the makefile find the SDK properly?
You might want to add a note how to get Mac OS X. That is, if you have bough Mac OS X from the App Store, the older versions are still available for Download from the Purchases tab.
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/Jacob Carlborg