def no_use_pep517_callback(option, opt, value, parser):
<EOL>if value is not None:<EOL><INDENT>msg = """<STR_LIT>"""<EOL>raise_option_error(parser, option=option, msg=msg)<EOL><DEDENT>parser.values.use_pep517 = False<EOL>
Process a value provided for the --no-use-pep517 option.

This is an optparse.Option callback for the no_use_pep517 option.