anchor.diff:    /* Make sure PyXML modules can be found at run-time. */ ''
       for i in "$out/bin/"* ; do
         wrapProgram "$i" \
  -        --prefix PYTHONPATH : "$(toPythonPath ${pyxml})" \
  +        --prefix PYTHONPATH : "$(toPythonPath ${pythonPackages.pyxml})" \
           --prefix PYTHONPATH : "$(toPythonPath ${pythonPackages.lxml})" \
           --prefix PATH : ${pythonPackages.python}/bin
       done
  
positive.code:   propagatedBuildInputs = [
      /* Python is used at run-time to execute scripts, e.g.
         those in the "Effects" menu. */
      pyxml
      pythonPackages.lxml
      pythonPackages.python
    ];
  
    buildInputs = [
  
negative.code: , poppler
  , popt
  , pythonPackages
  , xorg
  , zlib
  
  