anchor.diff:  
     __impureHostDeps = stdenv.lib.optional stdenv.isDarwin "/usr/lib/libicucore.dylib";
   
  -  buildPhase = "./build.sh --confirm";
  +  buildPhase = "./build.py --confirm -j$NIX_BUILD_CORES";
  +
  +  enableParallelBuilding = true;
   
     installPhase = ''
       mkdir -p $out/share/doc/phantomjs
  
positive.code: 
    patchPhase = ''
      patchShebangs .
      sed -i -e 's|/bin/pwd|pwd|' src/qt/qtbase/configure 
    '' + stdenv.lib.optionalString stdenv.isDarwin ''
      sed -i 's,-licucore,/usr/lib/libicucore.dylib,' src/qt/qtwebkit/Source/WTF/WTF.pri
      substituteInPlace src/qt/qtwebkit/Tools/qmake/mkspecs/features/features.pri \
  
negative.code: { stdenv, fetchgit,
    bison2, flex, fontconfig, freetype, gperf, icu, openssl, libjpeg, libpng, perl, python, ruby, sqlite,
    darwin, writeScriptBin, cups
  }:
  