net-irc/quassel[qt4,webkit] depends on dev-qt/qtwebkit:4 which is ancient and will never see any security updates. Since there's a perfectly good Qt 5 available, I'd suggest just removing the qt4 USE flag completely.
(In reply to Michael Palimaka (kensington) from comment #0) > ... > Since there's a perfectly good Qt 5 available, I'd suggest just removing the > qt4 USE flag completely. Still font issues in Qt5/Plasma env as Qt 4 won't go away in the near future, I decided to keep qt4 build option. https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8110a18906f52f1c600a1f1976ad7e17b878279e