qt Add support for exceptions - like catching them inside the event loop (recommended by upstream) Enable HTML5 audio/video support via media-libs/gstreamer Use dev-libs/libxml2 for XML parsing Enable HTML5 audio/video support via dev-qt/qtmultimedia Build QML/QtQuick bindings Add support for WebP image format Build various things that depend on dev-qt/qtwidgets, e.g. the WebKitWidgets library Enable XSLT support https://bugreports.qt-project.org/ http://qt-project.org/doc/