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: 
    enableParallelBuilding = true;
  
    meta = {
      description = "Free, open source, multi-platform ebook (ePub) editor";
      homepage = https://github.com/Sigil-Ebook/Sigil/;
      license = stdenv.lib.licenses.gpl3;
      inherit version;
      maintainers = with stdenv.lib.maintainers; [ ramkromberg ];
      platforms = with stdenv.lib.platforms; linux;
    };
  }
  
negative.code: 
  stdenv.mkDerivation rec {
    name = "sigil-${version}";
    version = "0.9.7";
  
    src = fetchFromGitHub {
      sha256 = "17m2f7pj2sx5rxrbry6wk1lvviy8fi2m270h47sisywnrhddarh7";
      rev = version;
      repo = "Sigil";
      owner = "Sigil-Ebook";
  