OK I did that, I also installed the qt SDK you mentioned above because I was getting the same error.

I now have---

/usr/bin/ld: cannot find -lQtMultimedia
collect2: error: ld returned 1 exit status
make: *** [QtBitcoinTrader] Error 1

--- I installed qtmultimedia-dev, but still get the error. Synaptic has quite a few qtmultimedia packages, I guess I need one of those but which one ?

Also using qtcreator gives me the same error.