Qt6.0 Windows: namespace build fails on qtquickcontrols2

FAILED: qtquickcontrols2/src/imports/nativestyle/CMakeFiles/qtquickcontrols2nativestyleplugin.dir/qstyle/windows/qquickwindowsstyle.cpp.obj

cmake -DCMAKE_C_COMPILER=cl.exe -DCMAKE_CXX_COMPILER=cl.exe -GNinja -DCMAKE_BUILD_TYPE=Release -DQT_BUILD_EXAMPLES=OFF -DBUILD_WITH_PCH=OFF -DOPENSSL_ROOT_DIR=C:\openssl\include\.. -DFEATURE_system_zlib=OFF -DPostgreSQL_ROOT=C:\Utils\postgresql\pgsql\lib\.. -DQT_BUILD_TESTS=OFF -DQT_NAMESPACE=RTA C:\Users\joaijala\RTA\src-6.0.1 -DCMAKE_INSTALL_PREFIX:PATH=C:\Users\joaijala\RTA\src-6.0.1

[4103/5229] Building CXX object qtquickcontrols2\src\imports\nativestyle\CMakeFiles\qtquickcontrols2nativestyleplugin.dir\qstyle\windows\qquickwindowsstyle.cpp.obj
FAILED: qtquickcontrols2/src/imports/nativestyle/CMakeFiles/qtquickcontrols2nativestyleplugin.dir/qstyle/windows/qquickwindowsstyle.cpp.obj 
C:\PROGRA~2\MICROS~2\2019\PROFES~1\VC\Tools\MSVC\1427~1.291\bin\Hostx64\x64\cl.exe  /nologo /TP -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DEPRECATED_WARNINGS_SINCE=0x060000 -DQT_DISABLE_DEPRECATED_BEFORE=0x040800 -DQT_GUI_LIB -DQT_NAMESPACE=RTA -DQT_NETWORK_LIB -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_EXCEPTIONS -DQT_OPENGL_LIB -DQT_PLUGIN -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_QUICKCONTROLS2_LIB -DQT_QUICKTEMPLATES2_LIB -DQT_QUICK_LIB -DUNICODE -DWIN32 -DWIN64 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -D_UNICODE -D_WIN64 -Dqtquickcontrols2nativestyleplugin_EXPORTS -Iqtquickcontrols2\src\imports\nativestyle\qtquickcontrols2nativestyleplugin_autogen\include -Iqtquickcontrols2\src\imports\nativestyle -Iqtbase\include -Iqtquickcontrols2\src\imports\nativestyle\items -Iqtquickcontrols2\src\imports\nativestyle\qstyle -Iqtquickcontrols2\src\imports\nativestyle\util -Iqtdeclarative\src\qml -Iqtbase\include\QtQml\6.0.0 -Iqtbase\include\QtQml\6.0.0\QtQml -Iqtbase\src\corelib -Iqtbase\include\QtCore\6.0.0 -Iqtbase\include\QtCore\6.0.0\QtCore -Iqtbase\include\QtCore -Iqtbase\mkspecs\win32-msvc -Iqtbase\include\QtQml -Iqtbase\include\QtNetwork -Iqtquickcontrols2\src\imports\nativestyle\qstyle\windows -Iqtbase\include\QtGui -IC:\VulkanSDK\1.2.141.2\Include -Iqtbase\include\QtQuick -Iqtbase\include\QtQmlModels -Iqtbase\include\QtOpenGL -Iqtbase\include\QtQuickControls2 -Iqtbase\include\QtQuickTemplates2 -Iqtbase\src\gui -Iqtbase\include\QtGui\6.0.0 -Iqtbase\include\QtGui\6.0.0\QtGui -Iqtquickcontrols2\src\quickcontrols2 -Iqtbase\include\QtQuickControls2\6.0.0 -Iqtbase\include\QtQuickControls2\6.0.0\QtQuickControls2 -Iqtdeclarative\src\quick -Iqtbase\include\QtQuick\6.0.0 -Iqtbase\include\QtQuick\6.0.0\QtQuick -Iqtdeclarative\src\qmlmodels -Iqtbase\include\QtQmlModels\6.0.0 -Iqtbase\include\QtQmlModels\6.0.0\QtQmlModels -Iqtquickcontrols2\src\quicktemplates2 -Iqtbase\include\QtQuickTemplates2\6.0.0 -Iqtbase\include\QtQuickTemplates2\6.0.0\QtQuickTemplates2 /DWIN32 /D_WINDOWS /GR /EHsc /DNDEBUG -O2 -MD /W3 /wd4530 /wd4577 -Zc:__cplusplus -permissive- -utf-8 -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zc:externConstexpr -Zc:wchar_t -std:c++17 /showIncludes /Foqtquickcontrols2\src\imports\nativestyle\CMakeFiles\qtquickcontrols2nativestyleplugin.dir\qstyle\windows\qquickwindowsstyle.cpp.obj /Fdqtquickcontrols2\src\imports\nativestyle\CMakeFiles\qtquickcontrols2nativestyleplugin.dir\ /FS -c qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(100): error C2653: 'QWindowsStylePrivate': is not a class or namespace name
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(100): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(100): error C2610: 'int RTA::RTA::QWindowsStylePrivate(void)': is not a special member function or comparison operator which can be defaulted
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(102): error C2653: 'QWindowsStylePrivate': is not a class or namespace name
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(107): error C2653: 'QWindowsStylePrivate': is not a class or namespace name
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(205): error C2653: 'QWindowsStyle': is not a class or namespace name
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(205): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(205): error C2061: syntax error: identifier 'QWindowsStylePrivate'
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(206): error C2550: 'RTA::RTA::QWindowsStyle': constructor initializer lists are only allowed on constructor definitions
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(207): warning C4508: 'RTA::RTA::QWindowsStyle': function should return a value; 'void' return type assumed
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(214): error C2653: 'QWindowsStyle': is not a class or namespace name
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(214): error C2065: 'dd': undeclared identifier
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(214): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
qtquickcontrols2\src\imports\nativestyle\qstyle\windows\qquickwindowsstyle.cpp(214): error C2365: 'RTA::RTA::QWindowsStyle': redefinition; previous definition was 'function'