QT5: Where are the multimedia libraries?

Hi, I am using / trying to use QT just for a few days now. I have build QT5 from the source (for the zip file … not from Git) as described here: http://qt-project.org/wiki/MinGW-64-bit Building OpenSSL, ICU, Qt5 and Webkit works fine. My first Hello-World-app works fine, too. But now I want to go a little bit in the deep and wanted to play an MP3 file. I found some examples in the qtmultimedia folder of Qt, but when I try to compile them, I get an error message: Qt Multimedia not found. I have already tried “mingw32-make module-qtmultimedia” (as I found it on an other web page), but it still doesn’t work. Does someone have any Ideas? Regards, Rainer