def set_undefined_options (self, src_cmd, *option_pairs):

        # Option_pairs: list of (src_option, dst_option) tuples

        src_cmd_obj = self.distribution.get_command_obj(src_cmd)
        src_cmd_obj.ensure_finalized()
        for (src_option, dst_option) in option_pairs:
            if getattr(self, dst_option) is None:
                setattr(self, dst_option,
                        getattr(src_cmd_obj, src_option))
Set the values of any "undefined" options from corresponding
dataset/ETHPy150Open babble/babble/include/jython/Lib/distutils/cmd.py/Command.set_undefined_options