https://botbot.me/freenode/nixos/2017-09-11/?msg=90952423&page=6
→ https://github.com/cleverca22/nix-misc/blob/master/default.nix#L10
https://botbot.me/freenode/nixos/2017-05-20/?msg=85912566&page=9
https://botbot.me/freenode/nixos/2016-05-30/?msg=66932491&page=1
https://botbot.me/freenode/nixos/2017-04-21/?msg=84380701&page=
See also: NixOS/nixpkgs#25240