Dependencies no longer available

[FRidh]

Unfortunately some dependencies are no longer available. While I never expected to have them for always available, it may be an idea to set up a small mirror. I might have to rebase to a newer Nixpkgs.

[tpwrules]

I was able to get everything to build correctly by running ulimit -n 4096 and updating my /etc/hosts to another mirror in order to get the dependencies: NixOS/nixpkgs#24683 (comment)