> It seems NetBSD's (and FreeBSD, at least 4.7-RC's) mktime(3) fails to
> convert a time in the "spring forward gap".

> I noticed this because the libc mktime() is rejected as broken when
> building Emacs 21.2 on NetBSD.

If there is a standard that specifies this, I think we should follow
it.  But absent that, I think it's the test that's broken, not our
mktime; I see nothing wrong with failing when asked to convert a time
that doesn't exist.

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