CI: QNX Gui application fails to build with missing QtDBus symbols

# CMakeLists.txt
cmake_minimum_required(VERSION 3.16)
project(blubb)
find_package(Qt6 COMPONENTS Core Gui)
add_executable(blubb main.cpp)
target_link_libraries(blubb PRIVATE Qt6::Core)
target_link_libraries(blubb PRIVATE Qt6::Gui)

// main.cpp
#include <qcoreapplication.h>

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    return app.exec();
}

: && /opt/qnx710/host/linux/x86_64/usr/bin/q++ -Vgcc_ntox86_64 -Wc,-isysroot,/opt/qnx710/target/qnx7 -lang[155/1892]
keFiles/blubb.dir/main.cpp.o -o blubb  -Wl,-rpath,/home/qt/work/install/target/lib  /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0  /home/qt/work/install/target/lib/libQt6Core.so.6.3.0  /opt/qnx710/target/qnx7/x86_64/usr/lib/li
bGLESv2.so  /opt/qnx710/target/qnx7/x86_64/usr/lib/libEGL.so && :                                                   /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: warning: libQt6DBus.so.6, needed by /home/qt/work/i
nstall/target/lib/libQt6Gui.so.6.3.0, not found (try using -rpath or -rpath-link)                                   /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusConnection::QDBusConnection(QDBusConnection const&)@Qt_6'                            /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusError::type() const@Qt_6'                                                            /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusArgument::endStructure()@Qt_6'                                                       /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusArgument::operator>>(int&) const@Qt_6'                                               /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusConnection::interface() const@Qt_6'                                                  /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `qDBusReplyFill(QDBusMessage const&, QDBusError&, QVariant&)@Qt_6'                         /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusArgument::QDBusArgument()@Qt_6'                                                      /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `typeinfo for QDBusAbstractAdaptor@Qt_6'                                                   /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusAbstractAdaptor::QDBusAbstractAdaptor(QObject*)@Qt_6'                                /opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusMessage::arguments() const@Qt_6'                                                     
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusAbstractInterface::QDBusAbstractInterface(QString const&, QString const&, char const*
, QDBusConnection const&, QObject*)@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusConnection::call(QDBusMessage const&, QDBus::CallMode, int) const@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusError::message() const@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusServiceWatcher::serviceRegistered(QString const&)@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusError::QDBusError()@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusAbstractInterface::qt_metacast(char const*)@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusArgument::beginStructure() const@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusConnection::unregisterObject(QString const&, QDBusConnection::UnregisterMode)@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusMetaType::registerMarshallOperators(QMetaType, void (*)(QDBusArgument&, void const*),
 void (*)(QDBusArgument const&, void*))@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusArgument::endMapEntry()@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusArgument::endStructure() const@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusConnection::baseService() const@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusError::QDBusError(QDBusError const&)@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusError::operator=(QDBusError const&)@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusAbstractInterface::qt_metacall(QMetaObject::Call, int, void**)@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusConnection::isConnected() const@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusMessage::setArguments(QList<QVariant> const&)@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusArgument::endMap() const@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
: undefined reference to `QDBusArgument::operator>>(QDBusObjectPath&) const@Qt_6'
/opt/qnx710/host/linux/x86_64/usr/bin/x86_64-pc-nto-qnx7.1.0-ld: /home/qt/work/install/target/lib/libQt6Gui.so.6.3.0
...