anchor.diff:  
     pythonPath = with python3Packages; [ lxml ];
   
  -  propagatedBuildInputs = with python3Packages; [ lxml ];
  -
     nativeBuildInputs = [ cmake pkgconfig makeWrapper ];
   
     buildInputs = [
       boost xercesc qtbase qttools qtwebkit qtxmlpatterns
  -    python3 python3Packages.lxml ];
  +    python3Packages.lxml ];
  +
  +  dontWrapQtApps = true;
   
     preFixup = ''
       wrapProgram "$out/bin/sigil" \
  -       --prefix PYTHONPATH : $PYTHONPATH:$(toPythonPath ${python3Packages.lxml})
  +       --prefix PYTHONPATH : $PYTHONPATH \
  +       ''${qtWrapperArgs[@]}
     '';
   
     enableParallelBuilding = true;
  
positive.code: { stdenv, fetchFromGitHub, cmake, pkgconfig, makeWrapper
  , boost, xercesc
  , qtbase, qttools, qtwebkit, qtxmlpatterns
  , python3, python3Packages
  }:
  
  stdenv.mkDerivation rec {
    name = "sigil-${version}";
    version = "0.9.14";
  
  
negative.code:     description = "Free, open source, multi-platform ebook (ePub) editor";
      homepage = https://github.com/Sigil-Ebook/Sigil/;
      license = licenses.gpl3;
      maintainers = [ maintainers.ramkromberg ];
      platforms = platforms.linux;
    };
  }
  