let
  inherit (import <nixpkgs> {}) fetchFromGitHub;
  nixpkgs = fetchFromGitHub {
    owner  = "NixOS";
    repo   = "nixpkgs-channels";
    rev    = "54f385241e6649128ba963c10314942d73245479";
    sha256 = "0bd4v8v4xcdbaiaa59yqprnc6dkb9jv12mb0h5xz7b51687ygh9l";
  };
in import nixpkgs