anchor.diff:          description = ''
             Shell commands executed just before XFCE is started.
           '';
  +      };
  +
  +      enableXfwm = mkOption {
  +        type = types.bool;
  +        default = true;
  +        description = "Enable the XFWM (default) window manager.";
         };
       };
   
  
positive.code:         pkgs.xfce.xfce4_appfinder
          pkgs.xfce.tumbler       # found via dbus
        ]
        ++ optional config.powerManagement.enable pkgs.xfce.xfce4_power_manager
        ++ optional config.networking.networkmanager.enable pkgs.networkmanagerapplet
        ++ optionals (!cfg.noDesktop)
  
negative.code:         pkgs.xfce.xfce4volumed
          pkgs.xfce.xfce4-screenshooter
          pkgs.xfce.xfconf
          # This supplies some "abstract" icons such as
          # "utilities-terminal" and "accessories-text-editor".
          pkgs.gnome3.defaultIconTheme
  