Builds fail at linking:

....
QupZilla-1.8.9/src/../bin/libQupZilla.so: undefined reference to `qt_static_plugin_QtWebKitPlugin()'


Seems to come from lib/plugins/qtwebkit/qtwebkitplugin.cpp

#if QT_VERSION < 0x050000
Q_EXPORT_PLUGIN2(qtwebkitplugins, QtWebKitPlugin)
#endif

#if (QT_VERSION < 0x050000)
Q_IMPORT_PLUGIN(qtwebkitplugins)
#else
Q_IMPORT_PLUGIN(QtWebKitPlugin)
#endif


So... this part:
Q_IMPORT_PLUGIN(QtWebKitPlugin)