anchor.diff:    ];
   
     buildInputs = [
  -    libxfce4util
       libxfce4ui
       xfce4-panel
  -    gtk2
  -    exo # needs exo with gtk2 support
  +    exo
       gnutls
       libgcrypt
     ];
  
positive.code: { lib, stdenv, fetchurl, pkg-config, intltool, libxfce4util, xfce4-panel, libxfce4ui,
    gtk2, exo, gnutls, libgcrypt, xfce }:
  
  let
    category = "panel-plugins";
  
negative.code: 
  stdenv.mkDerivation rec {
    pname  = "xfce4-mailwatch-plugin";
    version = "1.3.0";
  
    src = fetchurl {
      url = "mirror://xfce/src/${category}/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.bz2";
      sha256 = "0bmykjhd3gs1737fl3zn5gg6f3vlncak2xqz89zv5018znz1xy90";
    };
  
    nativeBuildInputs = [
  