@Barry Wardell suggested to use port select gcc similar to the already used port select mpi to select a default gcc executables. This means that the compiler can be called gcc rather than gcc-8 and one is closer to be able to use the generic.* files on OSX + MacPorts as well.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2276/use-port-select-gcc-for-osx-macports