custom-extension example broken

20:31:40: Running steps for project custom-extension...
20:31:40: Starting: "/home/qt/Qt/Tools/CMake/bin/cmake" --build /home/qt/Qt/Examples/Qt-6.8.1/wayland/custom-extension/build/Desktop_Qt_6_8_1-Debug --target all
[1/3 0.2/sec] Linking CXX executable cpp-client/custom-extension-cpp-client
FAILED: cpp-client/custom-extension-cpp-client 
: && /usr/bin/g++-13 -DQT_QML_DEBUG -g  cpp-client/CMakeFiles/custom-extension-cpp-client.dir/custom-extension-cpp-client_autogen/mocs_compilation.cpp.o cpp-client/CMakeFiles/custom-extension-cpp-client.dir/__/client-common/customextension.cpp.o cpp-client/CMakeFiles/custom-extension-cpp-client.dir/main.cpp.o cpp-client/CMakeFiles/custom-extension-cpp-client.dir/wayland-custom-protocol.c.o cpp-client/CMakeFiles/custom-extension-cpp-client.dir/qwayland-custom.cpp.o -o cpp-client/custom-extension-cpp-client  -Wl,-rpath,/home/qt/Qt/6.8.1/gcc_64/lib:  /home/qt/Qt/6.8.1/gcc_64/lib/libQt6WaylandClient.so.6.8.1  /usr/lib/x86_64-linux-gnu/libxkbcommon.so  /home/qt/Qt/6.8.1/gcc_64/lib/libQt6Gui.so.6.8.1  /usr/lib/x86_64-linux-gnu/libGLX.so  /usr/lib/x86_64-linux-gnu/libOpenGL.so  /home/qt/Qt/6.8.1/gcc_64/lib/libQt6Core.so.6.8.1  /usr/lib/x86_64-linux-gnu/libwayland-client.so  /usr/lib/x86_64-linux-gnu/libwayland-cursor.so  -Wl,-rpath-link,/home/qt/Qt/6.8.1/gcc_64/lib && :
/usr/bin/ld: cpp-client/CMakeFiles/custom-extension-cpp-client.dir/custom-extension-cpp-client_autogen/mocs_compilation.cpp.o: in function `(anonymous namespace)::QQmlTriviallyDestructibleDebuggingEnabler::QQmlTriviallyDestructibleDebuggingEnabler(bool)':
/home/qt/Qt/6.8.1/gcc_64/include/QtQml/qqmldebug.h:53:(.text+0x18): undefined reference to `QQmlDebuggingEnabler::enableDebugging(bool)'
/usr/bin/ld: cpp-client/CMakeFiles/custom-extension-cpp-client.dir/__/client-common/customextension.cpp.o: in function `(anonymous namespace)::QQmlTriviallyDestructibleDebuggingEnabler::QQmlTriviallyDestructibleDebuggingEnabler(bool)':
/home/qt/Qt/6.8.1/gcc_64/include/QtQml/qqmldebug.h:53:(.text+0x18): undefined reference to `QQmlDebuggingEnabler::enableDebugging(bool)'
/usr/bin/ld: cpp-client/CMakeFiles/custom-extension-cpp-client.dir/main.cpp.o: in function `(anonymous namespace)::QQmlTriviallyDestructibleDebuggingEnabler::QQmlTriviallyDestructibleDebuggingEnabler(bool)':
/home/qt/Qt/6.8.1/gcc_64/include/QtQml/qqmldebug.h:53:(.text+0x18): undefined reference to `QQmlDebuggingEnabler::enableDebugging(bool)'
collect2: error: ld returned 1 exit status
[2/3 0.3/sec] Linking CXX executable qml-client/custom-extension-qml-client
[3/3 0.4/sec] Linking CXX executable compositor/custom-extension-compositor
ninja: build stopped: subcommand failed.
20:31:47: The process "/home/qt/Qt/Tools/CMake/bin/cmake" exited with code 1.
Error while building/deploying project custom-extension (kit: Desktop Qt 6.8.1)
When executing step "Build"
20:31:47: Elapsed time: 00:08.