Mac-4.7.4/src/gui/kernel/symbian.pri

symbian {
    contains(QT_CONFIG, s60): LIBS+= $$QMAKE_LIBS_S60
    RESOURCES += symbian/symbianresources.qrc

    HEADERS += symbian/qsymbianevent.h
    SOURCES += symbian/qsymbianevent.cpp
}