I'm one of the maintainers of the c-ares project at
https://github.com/c-ares/c-ares and have had a couple of users report
this issue. At first glance it appears to be an issue introduced
between automake 1.16.1 and 1.16.3.
I actually did some testing on MacOS 11.4 with automake 1.16.4 and can
reproduce the issue. Whereas 1.16.1 on CentOS 8 it works fine. I
haven't tried backing off automake to 1.16.1 on MacOS.
Reported issues for c-ares are here:
https://github.com/c-ares/c-ares/issues/409
https://github.com/c-ares/c-ares/issues/416
Rerunning autoreconf -fi appears to succeed, but then when building
after configure, make immediately throws an error so it clearly didn't
actually work.
The autotools build hasn't been touched in years short of a code
reorganization a year or so ago.
I haven't had time yet to investigate if there is an older version of
c-ares that works with the newer automake to try to figure out a trigger.
I know this isn't much information to go off of, but the user just told
me they had opened this issue so I wanted to chime in as I'm not sure
when I'll have a chance to investigate further.
-Brad
