[issue28108] Python configure fails to detect tzname on platforms that have it.

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

Looking at the autoconf documentation, HAVE_TZNAME is only set iff struct tm does not have a tm_zone member *and* the external array tzname is found:

https://www.gnu.org/software/autoconf/manual/autoconf-2.64/html_node/Particular-Structures.html

If the struct tm does have a tm_zone member (which it does on Linux), the check for tzname is not even run.

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