def configuration_specifier_macros(self):
        """Ports may provide a way to abbreviate configuration specifiers to conveniently
        refer to them as one term or alias specific values to more generic ones. For example:

        (vista, win7) -> win # Abbreviate all Windows versions into one namesake.
        (precise, trusty) -> linux  # Change specific name of Linux distro to a more generic term.

        Returns a dictionary, each key representing a macro term ('win', for example),
        and value being a list of valid configuration specifiers (such as ['vista', 'win7']).
        """
        return self.CONFIGURATION_SPECIFIER_MACROS