anchor.diff:        parole
         ristretto
         xfce4-appfinder
  +      xfce4-notifyd
         xfce4-screenshooter
         xfce4-session
         xfce4-settings
  
positive.code:       noDesktop = mkOption {
          type = types.bool;
          default = false;
          description = "Don't install XFCE desktop components (xfdesktop, panel and notification daemon).";
        };
  
        enableXfwm = mkOption {
  
negative.code:     # Systemd services
      systemd.packages = with pkgs.xfce; [
        (thunar.override { thunarPlugins = cfg.thunarPlugins; })
        xfce4-notifyd
      ];
  
    };
  }
  