/var/db/pkg/media-plugins/kipi-plugins-3.4.0/RDEPEND has sys-devel/bison and sys-devel/flex because kipi-plugins ebuilds are using RDEPEND="${DEPEND} ..." instead of RDEPEND="${COMMON_DEPEND} ..." DEPEND="${COMMON_DEPEND} ...".
Fixed. How's your quizzes going? :D