def METHOD_NAME(self, env):
    """Set TIX_LIBRARY to the directory containing Tix.tcl.
    For further info, see:
    * http://tix.sourceforge.net/docs/pdf/TixUser.pdf
    """
    # When using tkinter.tix from within spack provided python+tkinter+tix,
    # python will not be able to find Tix unless TIX_LIBRARY is set.
    env.set("TIX_LIBRARY", os.path.dirname(find(self.prefix, "Tix.tcl")[0]))