anchor.diff:  
     nativeBuildInputs = [ cmake extra-cmake-modules pkgconfig qmake qttools ];
   
  -  # on 2.1.2: RCC: Error in 'autoscroll.qrc': Cannot find file 'locale/ar_SA.qm'
  -  enableParallelBuilding = false;
  +  enableParallelBuilding = true;
   
     meta = with stdenv.lib; {
       description = "QtWebEngine based cross-platform web browser";
  
positive.code:     export FALKON_PREFIX=$out
    '';
  
    dontUseCmakeConfigure = true;
  
    buildInputs = [
      libpthreadstubs libxcb libXdmcp
      kwallet
  
negative.code: , libpthreadstubs, libxcb, libXdmcp, qtsvg, qttools, qtwebengine, qtx11extras, kwallet, openssl }:
  
  stdenv.mkDerivation rec {
    # KDE hasn't made a release of falkon yet so we just track git for now which is
    # based on the most recent release of qupzilla
    # This wip version is 2.1.99 so we add the .1
    name = "falkon-${version}.1";
    version = "2.1.99";
  
    src = fetchFromGitHub {
      owner  = "KDE";
      repo   = "falkon";
      rev    = "dd3c570c41b4b3d0ad17202b78bf14cf1ac56495";
      sha256 = "07d40cpckaprj74mr06k3mfriwb471bdmq60smls34y62ss55q9d";
    };
  
    preConfigure = ''
  