QtWebKit doesn't build with ICU 59.1

/home/apol/build-devel/qt5/qtbase/bin/qmake -o Makefile.JavaScriptCore.Target /home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/Target.pri
g++ -c -Wall -Wextra -Wreturn-type -Wchar-subscripts -Wformat-security -Wreturn-type -Wno-unused-parameter -Wno-sign-compare -Wno-switch -Wno-switch-enum -Wundef -Wmissing-noreturn -Winit-self -pipe -fno-stack-protector -fno-strict-aliasing -g -fdebug-types-section -O3 -fPIC -std=gnu++11 -fvisibility=hidden -fvisibility-inlines-hidden -pthread -fno-exceptions -D_REENTRANT -DBUILDING_QT__=1 -DNDEBUG -DENABLE_3D_RENDERING=1 -DENABLE_ACCELERATED_2D_CANVAS=1 -DENABLE_BLOB=1 -DENABLE_CANVAS_PATH=1 -DENABLE_CHANNEL_MESSAGING=1 -DENABLE_CSS_BOX_DECORATION_BREAK=1 -DENABLE_CSS_COMPOSITING=1 -DENABLE_CSS_EXCLUSIONS=1 -DENABLE_CSS_FILTERS=1 -DENABLE_CSS_IMAGE_SET=1 -DENABLE_CSS_REGIONS=1 -DENABLE_CSS_SHAPES=1 -DENABLE_CSS_STICKY_POSITION=1 -DENABLE_CSS_TRANSFORMS_ANIMATIONS_UNPREFIXED=1 -DENABLE_DATALIST_ELEMENT=1 -DENABLE_DETAILS_ELEMENT=1 -DENABLE_DEVICE_ORIENTATION=1 -DENABLE_DOWNLOAD_ATTRIBUTE=1 -DENABLE_FAST_MOBILE_SCROLLING=1 -DENABLE_FILTERS=1 -DENABLE_FTPDIR=1 -DENABLE_FULLSCREEN_API=1 -DENABLE_GEOLOCATION=1 -DENABLE_GESTURE_EVENTS=1 -DENABLE_ICONDATABASE=1 -DENABLE_IFRAME_SEAMLESS=1 -DENABLE_INDEXED_DATABASE=1 -DENABLE_INPUT_TYPE_COLOR=1 -DENABLE_INSPECTOR=1 -DENABLE_INSPECTOR_SERVER=1 -DENABLE_JAVASCRIPT_DEBUGGER=1 -DENABLE_LEGACY_NOTIFICATIONS=1 -DENABLE_LEGACY_VIEWPORT_ADAPTION=1 -DENABLE_LEGACY_VENDOR_PREFIXES=1 -DENABLE_LEGACY_WEB_AUDIO=1 -DENABLE_LINK_PREFETCH=1 -DENABLE_METER_ELEMENT=1 -DENABLE_MHTML=1 -DENABLE_NOTIFICATIONS=1 -DENABLE_ORIENTATION_EVENTS=1 -DENABLE_PAGE_VISIBILITY_API=1 -DENABLE_PROGRESS_ELEMENT=1 -DENABLE_RESOLUTION_MEDIA_QUERY=1 -DENABLE_REQUEST_ANIMATION_FRAME=1 -DENABLE_SHARED_WORKERS=1 -DENABLE_SMOOTH_SCROLLING=1 -DENABLE_SQL_DATABASE=1 -DENABLE_SUBPIXEL_LAYOUT=1 -DENABLE_SVG=1 -DENABLE_SVG_FONTS=1 -DENABLE_TOUCH_ADJUSTMENT=1 -DENABLE_TOUCH_EVENTS=1 -DENABLE_TOUCH_SLIDER=1 -DENABLE_VIDEO_TRACK=1 -DENABLE_VIEW_MODE_CSS_MEDIA=1 -DENABLE_WEB_SOCKETS=1 -DENABLE_WEB_TIMING=1 -DENABLE_WORKERS=1 -DENABLE_XHR_TIMEOUT=1 -DWTF_USE_TILED_BACKING_STORE=1 -DWTF_USE_CROSS_PLATFORM_CONTEXT_MENUS=1 -DHAVE_QTQUICK=1 -DHAVE_QTPRINTSUPPORT=1 -DHAVE_QSTYLE=1 -DHAVE_QTTESTLIB=1 -DHAVE_QTPOSITIONING=1 -DHAVE_QTSENSORS=1 -DWTF_USE_LIBJPEG=1 -DWTF_USE_LIBPNG=1 -DWTF_USE_3D_GRAPHICS=1 -DENABLE_WEBGL=1 -DENABLE_VIDEO=1 -DWTF_USE_GSTREAMER=1 -DWTF_USE_NATIVE_FULLSCREEN_VIDEO=1 -DHAVE_SQLITE3=1 -DENABLE_GAMEPAD=1 -DWTF_USE_LEVELDB=1 -DWTF_USE_GLIB=1 -DENABLE_NETSCAPE_PLUGIN_API=1 -DWTF_USE_PLUGIN_BACKEND_XLIB=1 -DPLUGIN_ARCHITECTURE_X11=1 -DENABLE_PLUGIN_PROCESS=1 -DENABLE_BATTERY_STATUS=0 -DENABLE_CANVAS_PROXY=0 -DENABLE_CSP_NEXT=0 -DENABLE_CSS_GRID_LAYOUT=0 -DENABLE_CSS_HIERARCHIES=0 -DENABLE_CSS_IMAGE_ORIENTATION=0 -DENABLE_CSS_IMAGE_RESOLUTION=0 -DENABLE_CSS_SHADERS=0 -DENABLE_CSS_VARIABLES=0 -DENABLE_CSS3_CONDITIONAL_RULES=0 -DENABLE_CSS3_TEXT=0 -DENABLE_CSS3_TEXT_LINE_BREAK=0 -DENABLE_DASHBOARD_SUPPORT=0 -DENABLE_DATAGRID=0 -DENABLE_DATA_TRANSFER_ITEMS=0 -DENABLE_DIRECTORY_UPLOAD=0 -DENABLE_FILE_SYSTEM=0 -DENABLE_FONT_LOAD_EVENTS=0 -DENABLE_HIGH_DPI_CANVAS=0 -DENABLE_INPUT_SPEECH=0 -DENABLE_INPUT_TYPE_DATE=0 -DENABLE_INPUT_TYPE_DATETIME_INCOMPLETE=0 -DENABLE_INPUT_TYPE_DATETIMELOCAL=0 -DENABLE_INPUT_TYPE_MONTH=0 -DENABLE_INPUT_TYPE_TIME=0 -DENABLE_INPUT_TYPE_WEEK=0 -DENABLE_LEGACY_CSS_VENDOR_PREFIXES=0 -DENABLE_MATHML=0 -DENABLE_MEDIA_SOURCE=0 -DENABLE_MEDIA_STATISTICS=0 -DENABLE_MEDIA_STREAM=0 -DENABLE_MICRODATA=0 -DENABLE_MOUSE_CURSOR_SCALE=0 -DENABLE_NAVIGATOR_CONTENT_UTILS=0 -DENABLE_NETWORK_INFO=0 -DENABLE_NOSNIFF=0 -DENABLE_PROXIMITY_EVENTS=0 -DENABLE_QUOTA=0 -DENABLE_RESOURCE_TIMING=0 -DENABLE_SCRIPTED_SPEECH=0 -DENABLE_SECCOMP_FILTERS=0 -DENABLE_SHADOW_DOM=0 -DENABLE_STYLE_SCOPED=0 -DENABLE_TEMPLATE_ELEMENT=0 -DENABLE_TEXT_AUTOSIZING=0 -DENABLE_THREADED_HTML_PARSER=0 -DENABLE_TOUCH_ICON_LOADING=0 -DENABLE_USER_TIMING=0 -DENABLE_VIBRATION=0 -DENABLE_WEB_AUDIO=0 -DENABLE_XSLT=0 -DSTATICALLY_LINKED_WITH_WTF -DBUILDING_JavaScriptCore -DBUILDING_WEBKIT -DQT_ASCII_CAST_WARNINGS -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_CORE_LIB -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore -I. -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore -I/home/apol/devel/frameworks/qt5/qtwebkit/Source -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/WTF -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/assembler -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/bytecode -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/bytecompiler -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/heap -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/dfg -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/debugger -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/disassembler -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/interpreter -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/jit -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/llint -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/parser -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/profiler -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/runtime -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/tools -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/yarr -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/ForwardingHeaders -Igenerated -I/home/apol/build-devel/qt5/qtwebkit/Source/JavaScriptCore/generated/LLIntOffsetsExtractor -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/disassembler/udis86 -I/home/apol/devel/frameworks/qt5/qtwebkit/Source -I../include -I/home/apol/devel/frameworks/qt5/qtwebkit/Source/WTF -isystem /usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/home/apol/build-devel/qt5/qtbase/include -I/home/apol/build-devel/qt5/qtbase/include/QtCore -I.moc -I/home/apol/devel/frameworks/qt5/qtbase/mkspecs/linux-g++ -o .obj/API/JSStringRef.o /home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp
/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp: In function ‘OpaqueJSString* JSStringCreateWithCharacters(const JSChar*, size_t)’:
/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp:40:50: error: invalid conversion from ‘const JSChar* {aka const short unsigned int*}’ to ‘const UChar* {aka const char16_t*}’ [-fpermissive]
     return OpaqueJSString::create(chars, numChars).leakRef();
                                                  ^
In file included from /home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp:31:0:
/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/OpaqueJSString.h:49:39: note:   initializing argument 1 of ‘static WTF::PassRefPtr<OpaqueJSString> OpaqueJSString::create(const UChar*, unsigned int)’
     static PassRefPtr<OpaqueJSString> create(const UChar* characters, unsigned length)
                                       ^~~~~~
/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp: In function ‘OpaqueJSString* JSStringCreateWithCharactersNoCopy(const JSChar*, size_t)’:
/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp:65:125: error: invalid conversion from ‘const JSChar* {aka const short unsigned int*}’ to ‘const UChar* {aka const char16_t*}’ [-fpermissive]
     return OpaqueJSString::create(StringImpl::createWithoutCopying(chars, numChars, WTF::DoesNotHaveTerminatingNullCharacter)).leakRef();
                                                                                                                             ^
In file included from /home/apol/devel/frameworks/qt5/qtwebkit/Source/WTF/wtf/text/WTFString.h:29:0,
                 from /home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/OpaqueJSString.h:30,
                 from /home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp:31:
/home/apol/devel/frameworks/qt5/qtwebkit/Source/WTF/wtf/text/StringImpl.h:431:57: note:   initializing argument 1 of ‘static WTF::PassRefPtr<WTF::StringImpl> WTF::StringImpl::createWithoutCopying(const UChar*, unsigned int, WTF::HasTerminatingNullCharacter)’
     WTF_EXPORT_STRING_API static PassRefPtr<StringImpl> createWithoutCopying(const UChar* characters, unsigned length, HasTerminatingNullCharacter);
                                                         ^~~~~~~~~~~~~~~~~~~~
/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp: In function ‘const JSChar* JSStringGetCharactersPtr(JSStringRef)’:
/home/apol/devel/frameworks/qt5/qtwebkit/Source/JavaScriptCore/API/JSStringRef.cpp:86:30: error: invalid conversion from ‘const UChar* {aka const char16_t*}’ to ‘const JSChar* {aka const short unsigned int*}’ [-fpermissive]
     return string->characters();