After a little hint i've got the problem. You install the sqlite plugin for akonadi to
/usr/lib/plugins/sqldrivers/libqsqlite3.so
But Qt looks for plugins at
qmake -query QT_INSTALL_PLUGINS
which is /usr/lib/x86_64-linux-gnu/qt4/plugins
so to get a working plugin we need to symlink
sudo ln -s /usr/lib/plugins/sqldrivers/libqsqlite3.so /usr/lib/x86_64-linux-gnu/qt4/plugins
or better - install the plugin in the right directory
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After a little hint i've got the problem. You install the sqlite plugin for akonadi to plugins/ sqldrivers/ libqsqlite3. so
/usr/lib/
But Qt looks for plugins at
qmake -query QT_INSTALL_PLUGINS
which is /usr/lib/ x86_64- linux-gnu/ qt4/plugins
so to get a working plugin we need to symlink plugins/ sqldrivers/ libqsqlite3. so /usr/lib/ x86_64- linux-gnu/ qt4/plugins
sudo ln -s /usr/lib/
or better - install the plugin in the right directory