{
  config,
  lib,
  pkgs,
  ...
}: let
  rev = "master"; # 'rev' could be a git rev, to pin the overlay.
  url = "https://github.com/nix-community/nixpkgs-wayland/archive/${rev}.tar.gz";
  waylandOverlay = import "${builtins.fetchTarball url}/overlay.nix";
in {
  nixpkgs.overlays = [waylandOverlay];
}