{ config, lib, pkgs, ... }: { imports = [ ]; options.me = { steam_run_free.enable = lib.mkOption { type = lib.types.bool; default = false; example = true; description = "Whether we want to install steam_run_free."; }; }; config = lib.mkIf config.me.steam_run_free.enable ( lib.mkMerge [ { environment.systemPackages = with pkgs; [ steam-run-free ]; } ] ); }