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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def __add_options(parser):
 """ Add the `Configure` options to a option-parser instance or a option group. """

    parser.add_option('--upx-dir', default=None,
                      help='Directory containing UPX.')
    parser.add_option('-C', '--configfile',
                      default=DEFAULT_CONFIGFILE,
                      dest='configfilename',
                      help='Name of generated configfile (default: %default)')