Boost in Qt: Installation and Symbol(s) not found for architectures x86_64

Question

I am back to Qt and C++ programming after a year break. I am trying to install boost library into Qt on Mac (10.9.4) and I am completely confused. This is what I did:

I

Answer 1

You need to link with boost too!

LIBS += -L/usr/local/Cellar/boost/1.55.0_2/lib -lboost