def METHOD_NAME(self, env):
    # environment as in Gaudi.xenv
    env.prepend_path("PATH", self.prefix.scripts)
    env.prepend_path("PYTHONPATH", self.prefix.python)
    env.prepend_path("LD_LIBRARY_PATH", self.prefix.lib)
    env.prepend_path("LD_LIBRARY_PATH", self.prefix.lib64)