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Building gcc with --HEAD results in most of the executables not having a version suffix, e.g. Building/installing gcc 6 would result in gcc-6, g++-6, etc. being installed, while building/installing gcc --HEAD would result in gcc-, g++-, etc. being installed. The lack of a version suffix prevented brew from recognizing a valid gcc install, resulting in brew instructing users to install gcc before building certain formulae even though gcc is installed. A patch to the gcc formula makes the version number for --HEAD builds the major version number of the stable version + 1 (7 at this time). This patch teaches brew to recognize current --HEAD builds as valid compilers.