def METHOD_NAME(self, env):
    # We don't want an AMREX_HOME the user may have set already
    env.unset("AMREX_HOME")
    # Help force Amrvis to not pick up random system compilers
    if "+mpi" in self.spec:
        env.set("MPI_HOME", self.spec["mpi"].prefix)
        env.set("CC", self.spec["mpi"].mpicc)
        env.set("CXX", self.spec["mpi"].mpicxx)
        env.set("F77", self.spec["mpi"].mpif77)
        env.set("FC", self.spec["mpi"].mpifc)
    # Set CONFIG_FILEPATH so Amrvis can find the configuration
    # file, amrvis.defaults.
    env.set("CONFIG_FILEPATH", self.spec.prefix.etc)