anchor.diff:  
     propagatedBuildInputs = with python3Packages; [ lxml ];
   
  +  nativeBuildInputs = [ cmake pkgconfig makeWrapper ];
  +
     buildInputs = [
  -    cmake pkgconfig
       boost xercesc qtbase qttools qtwebkit qtxmlpatterns
  -    python3 python3Packages.lxml makeWrapper
  -  ];
  +    python3 python3Packages.lxml ];
   
     preFixup = ''
       wrapProgram "$out/bin/sigil" \
  
positive.code: 
  stdenv.mkDerivation rec {
    name = "sigil-${version}";
    version = "0.9.6";
  
    src = fetchFromGitHub {
      sha256 = "0hihd5f3avpdvxwp5j80qdg74zbw7p20y6j9q8cw7wd0bak58h9c";
      rev = version;
      repo = "Sigil";
      owner = "Sigil-Ebook";
  
negative.code: 
    enableParallelBuilding = true;
  
    meta = with stdenv.lib; {
      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;
    };
  }
  