Part of the targets/desktop/kde/package.use file: "x11-libs/qt-sql mysql" This was set after bug#291996 . This was done, because at that time MySQL was the default backend of akondi-server and had an dep on qt-sql[mysql]. Since 07 Sep 2010 SQLite is the default backend, so this entry is needless. No other package in kde-meta depends on qt-sql[mysql], so MySQL can be cleaned from a default KDE install. Reproducible: Always
Dear god, I completely forgot about this. Added to the next KDE meeting agenda.
Fixed, thanks!