Unable to build QtOpcua Add-On with Conan, Qt6.0.1, linux-g++-Ubuntu20.04-x64

Description
Install Qt6.0.1, Cmake, Ninja and Conan with online installer.
 
Run build command:
conan install qtopcua/6.0.1@qt/snapshot --build=missing --profile=/home/qt/RTA/qt5/Tools/Conan/profiles/qt-6.0.1-gcc-x86_64 -s build_type=Release -g cmake_paths -g cmake -g deploy

Build fails:
make[2]: *** [src/opcua/CMakeFiles/QtOpcUa_header_check.dir/build.make:147: src/opcua/header_client/qopcuaaddreferenceitem.h.o] Error 1
Assembler messages:
Fatal error: can't create header_client/qopcuaaddnodeitem.h.o: No such file or directory
 
make[2]: *** [src/opcua/CMakeFiles/QtOpcUa_header_check.dir/build.make:143: src/opcua/header_client/qopcuaaddnodeitem.h.o] Error 1
 
Assembler messages:
 
Fatal error: can't create header_client/qopcuaapplicationdescription.h.o: No such file or directory
 
make[2]: *** [src/opcua/CMakeFiles/QtOpcUa_header_check.dir/build.make:151: src/opcua/header_client/qopcuaapplicationdescription.h.o] Error 1
 
make[2]: Leaving directory '/home/qt/.conan/data/qtopcua/6.0.1/qt/snapshot/build/9105b5b4ab5d474532cfc28699da368141e8a4cf'
 
make[1]: *** [CMakeFiles/Makefile2:1080: src/opcua/CMakeFiles/QtOpcUa_header_check.dir/all] Error 2
 
make[1]: Leaving directory '/home/qt/.conan/data/qtopcua/6.0.1/qt/snapshot/build/9105b5b4ab5d474532cfc28699da368141e8a4cf'
 
make: *** [Makefile:163: all] Error 2
 
CMAKE_PREFIX_PATH for 'qtopcua/6.0.1' build is: /home/qt/RTA/qt5/6.0.1/gcc_64
 
CMAKE_PREFIX_PATH for 'qtopcua/6.0.1' build is: /home/qt/RTA/qt5/6.0.1/gcc_64
 
qtopcua/6.0.1@qt/snapshot:
 
qtopcua/6.0.1@qt/snapshot: ERROR: Package '9105b5b4ab5d474532cfc28699da368141e8a4cf' build failed
 
qtopcua/6.0.1@qt/snapshot: WARN: Build folder /home/qt/.conan/data/qtopcua/6.0.1/qt/snapshot/build/9105b5b4ab5d474532cfc28699da368141e8a4cf
 
ERROR: qtopcua/6.0.1@qt/snapshot: Error in build() method, line 116
 
self.run('cmake --build . %s' % cmake.build_config)
 
ConanException: Error 2 while executing cmake --build .
make[2]: *** [src/opcua/CMakeFiles/QtOpcUa_header_check.dir/build.make:147: src/opcua/header_client/qopcuaaddreferenceitem.h.o] Error 1
 
Assembler messages:
 
Fatal error: can't create header_client/qopcuaaddnodeitem.h.o: No such file or directory
Fatal error: can't create header_client/qopcuaaddnodeitem.h.o: No such file or directory
make[2]: *** [src/opcua/CMakeFiles/QtOpcUa_header_check.dir/build.make:143: src/opcua/header_client/qopcuaaddnodeitem.h.o] Error 1
 
 
Assembler messages:
 
Fatal error: can't create header_client/qopcuaapplicationdescription.h.o: No such file or directory
Fatal error: can't create header_client/qopcuaapplicationdescription.h.o: No such file or directory
make[2]: *** [src/opcua/CMakeFiles/QtOpcUa_header_check.dir/build.make:151: src/opcua/header_client/qopcuaapplicationdescription.h.o] Error 1
 
make[2]: Leaving directory '/home/qt/.conan/data/qtopcua/6.0.1/qt/snapshot/build/9105b5b4ab5d474532cfc28699da368141e8a4cf'
make[1]: *** [CMakeFiles/Makefile2:1080: src/opcua/CMakeFiles/QtOpcUa_header_check.dir/all] Error 2
 
make[1]: Leaving directory '/home/qt/.conan/data/qtopcua/6.0.1/qt/snapshot/build/9105b5b4ab5d474532cfc28699da368141e8a4cf'
 
make: *** [Makefile:163: all] Error 2
 
 
CMAKE_PREFIX_PATH for 'qtopcua/6.0.1' build is: /home/qt/RTA/qt5/6.0.1/gcc_64
CMAKE_PREFIX_PATH for 'qtopcua/6.0.1' build is: /home/qt/RTA/qt5/6.0.1/gcc_64
qtopcua/6.0.1@qt/snapshot:
qtopcua/6.0.1@qt/snapshot: ERROR: Package '9105b5b4ab5d474532cfc28699da368141e8a4cf' build failed
qtopcua/6.0.1@qt/snapshot: ERROR: Package '9105b5b4ab5d474532cfc28699da368141e8a4cf' build failed
qtopcua/6.0.1@qt/snapshot: WARN: Build folder /home/qt/.conan/data/qtopcua/6.0.1/qt/snapshot/build/9105b5b4ab5d474532cfc28699da368141e8a4cf
ERROR: qtopcua/6.0.1@qt/snapshot: Error in build() method, line 116
self.run('cmake --build . %s' % cmake.build_config)
ConanException: Error 2 while executing cmake --build .