How can I include a customized qt library in my necessitas / android-lighthouse project so that it is installed and used on the device?

The project settings give the option to use local qt libs instead of system qt libs. If I select this and put the modified library into the libs folder (with immutable flag set to prevent deletion during deploy step), the library is included in the apk, but ignored by the application.

Some details:
the customized library is libQtSql that now includes QSQLITE support
device is Icona A500, Honeycomb 3.1, rooted
host to compile is linux (Ubuntu natty)