anchor.diff:  
     configureFlags = [ "--enable-gtk3" ];
   
  -  postInstall = ''
  -    wrapProgram "$out/bin/xfce4-panel" \
  -      --prefix GST_PLUGIN_SYSTEM_PATH : "$GST_PLUGIN_SYSTEM_PATH" \
  -      --prefix GIO_EXTRA_MODULES : "${glib-networking}/lib/gio/modules"
  -  '';
  -
     meta =  {
       description = "Xfce's panel";
     };
  
positive.code: { mkXfceDerivation, makeWrapper, tzdata, exo, garcon, gtk2, gtk3, gettext, glib-networking, libxfce4ui, libxfce4util, libwnck3, xfconf }:
  
  mkXfceDerivation rec {
    category = "xfce";
  
negative.code: 
    sha256 = "1v3f2xjz9gwa8maqqvv9w2dh1cgy03v89a9ny7nrv0cjsxwwrr15";
  
    buildInputs = [ exo garcon gtk2 gtk3 glib glib-networking libxfce4ui libxfce4util libwnck3 xfconf ];
  
    patches = [ ../../xfce/core/xfce4-panel-datadir.patch ];
    patchFlags = "-p1";
  