Это старая версия документа.
Build IBASE sql driver (linux)
source
Prior install firebird to /opt/firebird
from here.
cd $QTDIR/qtbase/src/plugins/sqldrivers/ibase
qmake "INCLUDEPATH+=/opt/firebird/include" "LIBS+=-L/opt/firebird/lib -lfbclient" ibase.pro
make
make install