qt6-bb10/mkspecs/features/win32/qt_config.prf

load(qt_config)

equals(QMAKE_TARGET_OS, xp) {
    # http://blogs.msdn.com/b/vcblog/archive/2012/10/08/10357555.aspx?PageIndex=3
    equals(QT_ARCH, x86_64) {
        QMAKE_SUBSYSTEM_SUFFIX = ,5.02
    } else {
        QMAKE_SUBSYSTEM_SUFFIX = ,5.01
    }
}