anchor.diff:  
     xcfg = config.services.xserver;
     cfg = xcfg.desktopManager.xfce;
  -
  -  isXfce48 = pkgs.xfce ? libxfce4ui;
   
   in
   
  
positive.code:       };
  
      environment.systemPackages =
        [
          pkgs.gtk # To get GTK+'s themes.
          pkgs.hicolor_icon_theme
          pkgs.shared_mime_info
          pkgs.which # Needed by the xfce's xinitrc script.
  
negative.code:     environment.pathsToLink =
        [ "/share/xfce4" "/share/themes" "/share/mime" "/share/desktop-directories" ];
  
      environment.shellInit =
        ''
          export GIO_EXTRA_MODULES=${pkgs.xfce.gvfs}/lib/gio/modules
        '';
  
      # Enable helpful DBus services.
      services.udisks.enable = true;
      services.upower.enable = config.powerManagement.enable;
  
    };
  
  