Examples can't be configured due to target name conflict

CMake Error at /usr/share/cmake/Modules/ExternalProject.cmake:3497 (add_custom_target):                                                                                                 
  add_custom_target cannot create target "examples" because another target
  with the same name already exists.  The existing target is a custom target
  created in source directory
  "/home/stampho/work/Qt/qt6-dev-src/qtbase/examples".  See documentation for
  policy CMP0002 for more details.
Call Stack (most recent call first):
  qtwebengine/CMakeLists.txt:157 (externalproject_add)


CMake Error at /usr/share/cmake/Modules/ExternalProject.cmake:2453 (message):
  Target "examples" was not generated by ExternalProject_Add.
Call Stack (most recent call first):
  qtwebengine/CMakeLists.txt:166 (externalproject_add_stepdependencies)


-- Configuring incomplete, errors occurred!
See also "/home/stampho/work/Qt/qt6-dev-release/CMakeFiles/CMakeOutput.log".
See also "/home/stampho/work/Qt/qt6-dev-release/CMakeFiles/CMakeError.log".
CMake Error at /home/stampho/work/Qt/qt6-dev-src/qtbase/cmake/QtProcessConfigureArgs.cmake:932 (message):
  CMake exited with code 1.