These are internal notes only... full documentation will be added!
see: http://www.ics.com/blog/building-qt-5-raspberry-pi
build qt mysql driver:
cd <qt-everywhere>/qtbase/src/plugins/sqldrivers/mysql
/usr/local/Qt-5.4.0-raspberry/bin/qmake "INCLUDEPATH+=<rootfs>/usr/include/mysql" "LIBS+=-L<rootfs>/usr/lib/mysql -lmysqlclient_r" mysql.pro
su
make install