[tz] make rearguard_tarballs fails on macOS

Paul Eggert eggert at cs.ucla.edu
Sat Oct 17 08:27:13 UTC 2020

On 10/16/20 9:09 PM, Deborah Goldsmith wrote:
> According to Wikipedia Darwin is not POSIX-compatible but is compatible with the Single UNIX Specification, version 3.

The Single UNIX Specification version 3 is the same as POSIX-2001, so I guess 
2001 is as far as Apple has wanted to go, at least so far.

Wikipedia says AIX and HP-UX also don't go past POSIX-2001, so today's fix 
should be helpful on those old OSes too.

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