anchor.diff: -{ stdenv, fetchurl, pkgconfig, intltool, libxfce4util, xfce4-panel, libxfce4ui,
  - xfconf, gtk2, exo, xfce }:
  +{ stdenv, fetchurl, pkgconfig, intltool, libxfce4util, xfce4-panel,
  +  libxfce4ui, gtk3, exo, xfce }:
   
   let
     category = "panel-plugins";
  
positive.code:   };
  
    meta = with stdenv.lib; {
      homepage = "https://goodies.xfce.org/projects/panel-plugins/${pname}";
      description = "MPD plugin for Xfce panel";
      platforms = platforms.linux;
      maintainers = [ ];
      broken = true;
    };
  }
  
negative.code: 
  stdenv.mkDerivation rec {
    pname  = "xfce4-mpc-plugin";
    version = "0.5.2";
  
    src = fetchurl {
      url = "mirror://xfce/src/${category}/${pname}/${stdenv.lib.versions.majorMinor version}/${pname}-${version}.tar.bz2";
      sha256 = "0q3pysdp85b3c7g3b59y3c69g4nw6bvbf518lnri4lxrnsvpizpf";
    };
  
    nativeBuildInputs = [
      pkgconfig
      intltool
    ];
  
    buildInputs = [
      libxfce4util
      libxfce4ui
      xfce4-panel
      gtk3
      exo
    ];
  
    passthru.updateScript = xfce.updateScript {
      inherit pname version;
      attrPath = "xfce.${pname}";
  