Not sure what "first class" and "support" really means. The announcement text suggests they just install the main Nim distribution. Still, it's nice to see an announcement.
It perhaps bears noting that Gentoo has had a `dev-lang/nim` ebuild in their official repository for like 6+ years. I think it kind of pre-dates the git-ification of their process in 2015 and my recollection is that there was an ebuild around in 2014.
