[REG 6.3.0beta2->beta3] some activeqt examples not compiling on MinGW

C:\Users\qt\RTA\Qt_6.3.0\6.3.0\mingw_64\bin\qt-cmake -S C:\Users\qt\RTA\Qt_6.3.0\Examples\Qt-6.3.0\activeqt\menus -B C:\Users\qt\RTA\Qt_6.3.0\Examples\Qt-6.3.0\activeqt\menus\bld_mingw_64 -GNinja

[6/6] Linking CXX executable menusax.exe
FAILED: menusax.exe 
cmd.exe /C "cd . && C:\MINGW1120\mingw64\bin\g++.exe  -mwindows CMakeFiles/menusax.dir/menusax_autogen/mocs_compilation.cpp.obj CMakeFiles/menusax.dir/main.cpp.obj CMakeFiles/menusax.dir/menus.cpp.obj CMakeFiles/menusax.dir/menus.rc.obj -o menusax.exe -Wl,--out-implib,libmenusax.dll.a -Wl,--major-image-version,0,--minor-image-version,0  C:/Users/qt/RTA/Qt_6.3.0/6.3.0/mingw_64/lib/libQt6AxServer.a  C:/Users/qt/RTA/Qt_6.3.0/6.3.0/mingw_64/lib/libQt6AxBase.a  -ladvapi32  -lgdi32  -lole32  -loleaut32  -luser32  -luuid  C:/Users/qt/RTA/Qt_6.3.0/6.3.0/mingw_64/lib/libQt6Widgets.a  C:/Users/qt/RTA/Qt_6.3.0/6.3.0/mingw_64/lib/libQt6Gui.a  -ld3d11  -ldxgi  -ldxguid  C:/Users/qt/RTA/Qt_6.3.0/6.3.0/mingw_64/lib/libQt6Core.a  -lmpr  -luserenv  -lmingw32  C:/Users/qt/RTA/Qt_6.3.0/6.3.0/mingw_64/lib/libQt6EntryPoint.a  -lshell32  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cmd.exe /C "cd /D C:\Users\qt\RTA\Qt_6.3.0\Examples\Qt-6.3.0\activeqt\menus\bld_mingw_64 && C:\Users\qt\RTA\Qt_6.3.0\6.3.0\mingw_64\bin\idc.exe C:/Users/qt/RTA/Qt_6.3.0/Examples/Qt-6.3.0/activeqt/menus/bld_mingw_64/menusax.exe /idl C:/Users/qt/RTA/Qt_6.3.0/Examples/Qt-6.3.0/activeqt/menus/bld_mingw_64/menusax.idl -version 1.0 && midl C:/Users/qt/RTA/Qt_6.3.0/Examples/Qt-6.3.0/activeqt/menus/bld_mingw_64/menusax.idl /nologo /tlb C:/Users/qt/RTA/Qt_6.3.0/Examples/Qt-6.3.0/activeqt/menus/bld_mingw_64/menusax.tlb && C:\Users\qt\RTA\Qt_6.3.0\6.3.0\mingw_64\bin\idc.exe C:/Users/qt/RTA/Qt_6.3.0/Examples/Qt-6.3.0/activeqt/menus/bld_mingw_64/menusax.exe /tlb C:/Users/qt/RTA/Qt_6.3.0/Examples/Qt-6.3.0/activeqt/menus/bld_mingw_64/menusax.tlb && C:\Users\qt\RTA\Qt_6.3.0\6.3.0\mingw_64\bin\idc.exe C:/Users/qt/RTA/Qt_6.3.0/Examples/Qt-6.3.0/activeqt/menus/bld_mingw_64/menusax.exe /regserver""
C:\Users\qt\RTA\Qt_6.3.0\Examples\Qt-6.3.0\activeqt\menus\bld_mingw_64\menusax.idl
'midl' is not recognized as an internal or external command,
operable program or batch file.
ninja: build stopped: subcommand failed.