{ config, pkgs, lib, ... }:

let
  nixpkgs-wayland = import (builtins.fetchTarball {
    url = "https://github.com/colemickens/nixpkgs-wayland/archive/master.tar.gz";
  });

in {
  nixpkgs.overlays = [
    nixpkgs-wayland
  ];

  environment.systemPackages = with pkgs; [
    obs-studio
    obs-xdg-portal
  ];

  # … rest of your config
}