rec {
  nixpkgs = let
    gitRev = "835e9a7acce59c78130d2d4cc66a07a20403b185";
  in
    builtins.fetchTarball {
      url = "https://github.com/NixOS/nixpkgs/archive/${gitRev}.tar.gz";
      sha256 = "0j86vmk6z9fi19nqyp22cpml0zgslaw20b66v3w9lw988mql3615";
    };
  pkgs = import nixpkgs {
    system = builtins.currentSystem;
  };
}