I clone recursively qt5 superproject (branch 6.2) and I build qt5 superproject.

qtgraphicaleffects  is always defined as submodule (cf .gitmodules)

qtgraphicaleffects submodule should be remove from qt5 superproject submodule.

Moreover, I build in command line using cmake tool. if QT_BUILD_SUBMODULES is not defined in cmake options (CMAKE_OPTIONS="${CMAKE_OPTIONS} -DQT_BUILD_SUBMODULES=qtbase;....." in the command line, the default QT_BUILD_SUBMODULES variable contains qtgraphicaleffects in qt5 superproject.

qtgraphicalseffects should be remove from the default QT_BUILD_SUBMODULES variable.

If I define my own QT_BUILD_SUBMODULES list (without qtgraphicaleffects), all is build correctly.

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Error when executing configure command line (error when configure qtgraphicaleffects)

Trace in terminal :

• Running syncqt for module: 'QtDesignerComponents'
• Running syncqt for module: 'QtHelp'
• Tool 'Qt6::qhelpgenerator' will be built from source.
• Tool 'Qt6::qtattributionsscanner' will be built from source.
• Tool 'Qt6::qdoc' will be built from source.
  Configuring 'qtdoc'
  Configuring 'qtgraphicaleffects'
  CMake Error at qtgraphicaleffects/src/effects/CMakeLists.txt:7 (add_qml_module):
  Unknown CMake command "add_qml_module".