This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.
Use the "-H newc" flag.
See the man page on your Linux system and compare it to the man page on your SCO box- they have differing ideas on what the default for "c" should be. SCO took the path that says you should be able to read old archives without using a different flag; Linux as usual decided that new is better.
As it's rather well documented in both cases, I don't think either of them are "wrong".
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