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For example...
WARNING: You need to set up toolchain information before you can use this Qt ver sion for building. Consider setting one of these profiles as this profile's base profile: MSVC2012_x86, MSVC2012_x86_64.
If my Qt installation is x86, we know that MSVC2012_x86_64 cannot possibly be a suitable base profile. So let's filter out known bad matches before evaluating whether we can set the only base profile or not.