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This conflicts with rvm's installation recommendations (installing apple-gcc42 from homebrew), because the compiler is installed to /usr/local/bin/gcc-4.2, not /usr/bin/gcc-4.2. Obviously symlinking will "fix" it, but is less than ideal in that it requires touching the system's binary dir.
Since the proper compiler isn't discovered by the build process, any gems that have native extensions fail to build.
improve gcc-4.2 detection on osx, closes #1185