Hi, A couple of recent cases where an error "libpq is incorrectly linked to backend functions" broke the dblink test:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=lorikeet&dt=2020-08-22%2002:55:22 | REL9_6_STABLE | Windows https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=lorikeet&dt=2020-04-27%2022:46:16 | HEAD | Windows Before that, lorikeet last said that before commit a33245a8 apparently fixed something relevant, but curiously the message also appeared a couple of times on two Unixen. Perhaps we can write those off as lost in the mists of time. https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=lorikeet&dt=2018-09-29%2010:56:25 | HEAD | Windows https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=damselfly&dt=2018-09-10%2011:09:29 | HEAD | Illumos https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=jaguarundi&dt=2018-09-09%2018:11:15 | HEAD | FreeBSD
