trying to make a nixos package script

keycount.nix

{stdenv, fetchgit, xorg, glib, pkgconfig}:

stdenv.mkDerivation rec {
  name = "keycount";
  src = fetchgit {
    url = "https://github.com/willghatch/keycount";
    rev = "987b53057befe5b7edee6823f7d8c62a95042038";
    sha256 = "0akqb1pvhxy1x4rcd8cmzbgavq0214s6g3z7gkws59dm67hfmkgl";
  };
  nativeBuildInputs = [ pkgconfig ];
  buildInputs = [ xorg.libX11 xorg.xinput xorg.libXtst glib];
}