On a KDE4 Debian installation, where does the QtCore library install to?

I have installed every possible package that could have to do with QtCore (I think), but the QtCore library is nowhere to be found. Not in /usr/lib, not in /usr/local/lib, not in usr/include... you get the idea. Still, CMAKE gives the location of QT_QTCORE_LIBRARY_RELEASE as QT_QTCORE_LIBRARY_RELEASE-NOTFOUND and since it doesn't show up where I look, I can't tell it otherwise. I have installed qmake, libqtcore4, libqt4-dev and several other packages. To add insult to injury, _I am using the Qt4 version of Cmake._ Am I simply missing the _real_ QtCore package or is the library somewhere incredibly non-obvious?