On Wed, Mar 15, 2023 at 01:47:20PM +0100, Stefan Sperling wrote:
> Is the test suite passing? ("make tests" in the -portable source tree)

Oh, sorry... following the links you sent shows that running tests is how
you found out about the problem in the first place.

There is a placeholder getopt implementation in compat/getopt.c which is
used if HAVE_LIBBSD is not defined.

I suspect that this file gets compiled on MacOS, which unlike Linux should
already have BSD APIs such as getopt natively. And at run-time there is some
confusion between getopt() from MacOS libc and getopt() from the compat/getopt.c
file? Not sure what the root cause is, but following this trail might help.