I had the same problem that I just solved. It seems that the QtMultimedia module is now in the QtMobility package. Therefore, you need to install QtMobility, which provides QtMultimediaKit:
sudo apt-get install qtmobility-dev
When compiling, you must add the following flags:
-I/usr/include/QtMultimediaKit -I/usr/include/QtMobility -lQtMultimediaKit
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