import (fetchTarball {
  url = "https://github.com/NixOS/nixpkgs/archive/0bbeca2ff952e6a171534793ddd0fa97c8f9546a.tar.gz";
  sha256 = "0h1y4ffvyvkqs6k2pak02pby25va7c6c1y4p8xkwlzqwswxqxvfl";
})