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I believe this was a bug specific to the llvm-gcc compiler shipped with Xcode 4.1 and possibly Xcode 4.0. I do not have Xcode 4 on OS X 10.6 but haypo's test does fail with the llvm-gcc 4.2.1 that comes with Xcode 4.1 on 10.7. Can you confirm exactly which compiler you are using, i.e. the complete --version output from the compiler used in your python build? If you have not installed Xcode 4.2, one solution is to use CC=gcc-4.2 which uses the plain gcc-4.2, not llvm-gcc-4.2. For 10.6, I recommend sticking with Xcode 3 if at all possible for the time being.