{ }:
let
  hostpkgs = import <nixpkgs> {};
  srcDef = builtins.fromJSON (builtins.readFile ./nixpkgs.json);
  nixpkgs = hostpkgs.fetchFromGitHub {
    owner = "NixOS";
    repo = "nixpkgs";
    inherit (srcDef) rev sha256;
  };
in import nixpkgs { }