import (fetchTarball {
  url = "https://github.com/NixOS/nixpkgs/archive/34e41a91547e342f6fbc901929134b34000297eb.tar.gz";
  sha256 = "0mlqxim36xg8aj4r35mpcgqg27wy1dbbim9l1cpjl24hcy96v48w";
})