The answer was in the documentation.
First, make sure that the required packages for Qt4 development of your
distribution are installed, for Debian these are:
sudo apt-get install qt4-qmake libqt4-dev build-essential libboost-dev libboost-system-dev libboost-filesystem-dev libboost-program-options-dev libboost-thread-dev libssl-dev libdb4.8++-dev
then execute the following:
cd ~/nubit
qmake
make