Building the port, the following has happened to me every time for a period of time: => nettle-3.10.tar.gz doesn't seem to exist in /usr/ports/distfiles/. => Attempting to fetch https://ftpmirror.gnu.org/nettle/nettle-3.10.tar.gz nettle-3.10.tar.gz 0% of 2578 kB 0 Bps And there it stalls maybe forever. If you go to https://ftpmirror.gnu.org/nettle on the browser you are redirected somewhere else, in my case https://ftp.rediris.es/mirror/GNU/nettle If I try to manually download nettle-3.10.tar.gz from there to copy to /usr/ports/distfiles/ Firefox returns and error, so I guess the problem is in that Spanish mirror and with that specific file. I've tried using another mirror: https://mirror.kumi.systems/gnu/nettle/ and there it works fine. Thank you.
It seems to be an error on GNU side for its mirror site in Spain. You could add MASTER_SITE_GNU, with your preferred sites, to /etc/make.conf.