import (fetchTarball {
  url = "https://github.com/NixOS/nixpkgs/archive/8471ab76242987b11afd4486b82888e1588f8307.tar.gz";
  sha256 = "06pp6b6x78jlinxifnphkbp79dx58jr990fkm4qziq0ay5klpxd7";
})