./wtf/HashSet.h: In instantiation of ‘std::pair<WTF::HashTableConstIteratorAdapter<WTF::HashTable<typename TraitsArg::TraitType, typename TraitsArg::TraitType, WTF::IdentityExtractor<typename TraitsArg::TraitType>, HashArg, TraitsArg, TraitsArg>, typename TraitsArg::TraitType>, bool> WTF::HashSet<Value, HashFunctions, Traits>::add(const ValueType&) [with ValueArg = void*; HashArg = WTF::PtrHash<void*>; TraitsArg = WTF::HashTraits<void*>; typename TraitsArg::TraitType = void*; WTF::HashSet<Value, HashFunctions, Traits>::ValueType = void*]’:
heap/MarkStack.h:74:71:   required from here
./wtf/HashSet.h:191:32: error: could not convert ‘((WTF::HashSet<void*>*)this)->WTF::HashSet<void*>::m_impl.WTF::HashTable<void*, void*, WTF::IdentityExtractor<void*>, WTF::PtrHash<void*>, WTF::HashTraits<void*>, WTF::HashTraits<void*> >::add((* & value))’ from ‘pair<WTF::HashTableIterator<void*, void*, WTF::IdentityExtractor<void*>, WTF::PtrHash<void*>, WTF::HashTraits<void*>, WTF::HashTraits<void*> >,[...]>’ to ‘pair<WTF::HashTableConstIteratorAdapter<WTF::HashTable<void*, void*, WTF::IdentityExtractor<void*>, WTF::PtrHash<void*>, WTF::HashTraits<void*>, WTF::HashTraits<void*> >, void*>,[...]>’
         return m_impl.add(value);
                                ^
yarr/YarrInterpreter.cpp: In member function ‘bool JSC::Yarr::Interpreter::backtrackParenthesesOnceEnd(JSC::Yarr::ByteTerm&, JSC::Yarr::Interpreter::DisjunctionContext*)’:
yarr/YarrInterpreter.cpp:707:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
             if (backTrack->begin == notFound) {
             ^~
yarr/YarrInterpreter.cpp:711:9: note: here
         case QuantifierNonGreedy:
         ^~~~
make[2]: *** [Makefile.WebKit:2552: .obj/release-static/MainThread.o] Error 1
make[2]: *** [Makefile.WebKit:1062: .obj/release-static/YarrInterpreter.o] Error 1
make[2]: *** [Makefile.WebKit:1788: .obj/release-static/DateMath.o] Error 1
make[2]: Leaving directory '/tmp/makepkg/qt4/src/qt-everywhere-opensource-src-4.8.7/src/3rdparty/webkit/Source/JavaScriptCore'
make[1]: *** [Makefile.WebKit:43: sub-JavaScriptCore-JavaScriptCore-pro-make_default-ordered] Error 2
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/tmp/makepkg/qt4/src/qt-everywhere-opensource-src-4.8.7/src/3rdparty/webkit/Source'
make: *** [Makefile:747: sub-webkit-make_default-ordered] Error 2
==> ERROR: A failure occurred in build().
    Aborting...
Error making: qt4