undefined symbol at runtime with mongodb driver

[blackhawk]

Hi, I'm trying to use mongodb driver in qt. I installed mongodb-dev e libboost-dev on ubuntu 12.04 and it compiles. When I run the app from command line it's ok, but if I start a debug session with qtcreator at runtime it throws an undefined symbol error in QCoreApplication (_zn16qcoreapplicationc1erippci).

The .pro contains:

LIBS += -L/usr/lib/ -lmongoclient \
        -L/usr/lib/ -lboost_filesystem \
        -L/usr/lib/ -lboost_system \
        -L/usr/lib/ -lboost_thread \
        -L/usr/lib/ -lboost_program_options

LIBS += -L/usr/lib/ -lmongoclient \
        -L/usr/lib/ -lboost_filesystem \
        -L/usr/lib/ -lboost_system \
        -L/usr/lib/ -lboost_thread \
        -L/usr/lib/ -lboost_program_options

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Someone can help me ?
Thanks