Gentoo's Bugzilla –
Attachment 335250 Details for
Bug 448628[qt overlay] x11-libs/qt-declarative-5.0.0 USE=-accessibility - .obj/debug-shared/qquickitem.o: In function `QQuickItem::focusInEvent(QFocusEvent*)': qquickitem.cpp:(.text+0xe37): undefined reference to `vtable for QAccessibleEvent'