Adding additional libraries to qt5.git fails

agent:2021/03/25 10:59:32 build.go:379: CMake Error at qtbase/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:471 (add_executable):
agent:2021/03/25 10:59:32 build.go:379:   add_executable cannot create target "qmloscilloscope" because another
agent:2021/03/25 10:59:32 build.go:379:   target with the same name already exists.  The existing target is an
agent:2021/03/25 10:59:32 build.go:379:   executable created in source directory
agent:2021/03/25 10:59:32 build.go:379:   "/home/qt/work/qt/qt5/qtcharts/examples/charts/qmloscilloscope".  See
agent:2021/03/25 10:59:32 build.go:379:   documentation for policy CMP0002 for more details.