def METHOD_NAME(self, env):
    """Set TK_LIBRARY to the directory containing tk.tcl.
    For further info, see:
    * https://www.tcl-lang.org/man/tcl/TkCmd/tkvars.htm
    """
    # When using tkinter from within spack provided python+tkinter,
    # python will not be able to find Tk unless TK_LIBRARY is set.
    env.set("TK_LIBRARY", self._find_script_dir())