On Nov 17, 2013, at 16:11, Blair Zajac wrote: >>>>> Can we not use blacklists on 10.9? compiler.blacklist should work the same on 10.9 as it does on other systems. > I got it. I assumed the other compilers were still there. Thanks for clarifying. gcc was removed from Xcode in 4.2, leaving llvm-gcc and clang. llvm-gcc was removed in 5.0, leaving only clang.