anchor.diff:      '';
   
     flashbackEnabled = cfg.flashback.enableMetacity || length cfg.flashback.customSessions > 0;
  +
  +  notExcluded = pkg: mkDefault (!(lib.elem pkg config.environment.gnome3.excludePackages));
   
   in
   
  
positive.code:         /* gnome-boxes */
        ] config.environment.gnome3.excludePackages);
  
        # Let nautilus find extensions
        # TODO: Create nautilus-with-extensions package
        environment.sessionVariables.NAUTILUS_EXTENSION_DIR = "${config.system.path}/lib/nautilus/extensions-3.0";
  
negative.code:       environment.pathsToLink = [
          "/share/nautilus-python/extensions"
        ];
      })
  
      (mkIf serviceCfg.games.enable {
  