anchor.diff: -{ stdenv, pkgconfig, fetchFromGitHub, python2, bash, vala
  +{ stdenv, pkgconfig, fetchFromGitHub, python2, bash, vala_0_46
   , dockbarx, gtk2, xfce, pythonPackages, wafHook }:
   
   stdenv.mkDerivation rec {
  
positive.code:   '';
  
    meta = with stdenv.lib; {
      homepage = https://github.com/TiZ-EX1/xfce4-dockbarx-plugin;
      description = "A plugins to embed DockbarX into xfce4-panel";
      license = licenses.mit;
      platforms = platforms.linux;
  
negative.code:   pythonPath = [ dockbarx ];
  
    nativeBuildInputs = [ pkgconfig wafHook ];
    buildInputs = [ python2 vala_0_46 gtk2 pythonPackages.wrapPython ]
      ++ (with xfce; [ libxfce4util xfce4-panel xfconf xfce4-dev-tools ])
      ++ pythonPath;
  
  