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The negative test was written assuming gzip implementations would return an error code when invalid command line options were used. This is not always the case: BSD variants of gzip (e.g., FreeBSD, Apple) return success even when an invalid option is specified. Since this is out of the control of makeself, and behaviors will differ widely among the various supported compressors and platforms, it doesn't make sense to maintain this test. The same behavior is theoretically possible with 'tar' implementations and the --tar-extra flag.