Yes, it works since Qt 4.0. QtCore and QtGui modules are enabled by default. To change included modules, change contents of the QT variable (notice: "QT", not "Qt") in the .pro file. There are different ways to change the variable, for example:
QT -= gui # remove gui which is turned on by default
QT -= gui # remove gui which is turned on by default
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or
QT = core network # set modules to core and network
QT = core network # set modules to core and network
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For more details, take a look at qmake manual.
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