Weird failure in explain.out with OpenBSD

Hi all,

Buildfarm member gombessa just had an interesting failure:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=gombessa&dt=2020-12-29%2000%3A16%3A49
  Seq Scan on int8_tbl i8  (cost=N.N..N.N rows=N width=N) (actual
  time=N.N..N.N rows=N loops=N)
  Planning Time: N.N ms
- Execution Time: N.N ms
+ Execution Time: -N.N ms
 (3 rows)

Not sure what to think about that, as this implies the calculation of
a negative execution time.
Regards,
--
Michael