find_package(Qt4 REQUIRED QtCore QtGui QtXml Qt3Support)

include(${QT_USE_FILE})
add_definitions(-DQT3_SUPPORT)

# output of ldd

        libQt3Support.so.4 => /data1/qt/qt_4.5.3/Linux/2.6/x86_64/qt-x11-commercial-src-4.5.3/lib/libQt3Support.so.4 (0x00002adfeb24e000)
        libQtGui.so.4 => /data1/qt/qt_4.5.3/Linux/2.6/x86_64/qt-x11-commercial-src-4.5.3/lib/libQtGui.so.4 (0x00002adfeb75e000)
        libQtXml.so.4 => /data1/qt/qt_4.5.3/Linux/2.6/x86_64/qt-x11-commercial-src-4.5.3/lib/libQtXml.so.4 (0x00002adfec61f000)
        libQtSql.so.4 => /data1/qt/qt_4.5.3/Linux/2.6/x86_64/qt-x11-commercial-src-4.5.3/lib/libQtSql.so.4 (0x00002adfec787000)
        libQtNetwork.so.4 => /data1/qt/qt_4.5.3/Linux/2.6/x86_64/qt-x11-commercial-src-4.5.3/lib/libQtNetwork.so.4 (0x00002adfec8e3000)