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:         # "utilities-terminal" and "accessories-text-editor".
          pkgs.gnome.gnomeicontheme
          pkgs.desktop_file_utils
          pkgs.xfce.libxfce4ui
          pkgs.xfce.garcon
          pkgs.xfce.thunar_volman
  