build from source and NOT same as src.

..\src\configure -cmake

error is

```

WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.
Either set CMAKE_PREFIX_PATH or LLVM_INSTALL_DIR to the location of your llvm installation. On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution. On macOS, you can use Homebrew's llvm package.
WARNING: Clang-based lupdate parser will not be available. LLVM and Clang C++ libraries have not been found.

Qt is now configured for building. Just run 'cmake --build . --parallel'

Once everything is built, you must run 'cmake --install .'
Qt will be installed into 'C:/Program Files (x86)/Qt'

To configure and build other Qt modules, you can use the following convenience script:
/bin/qt-cmake-private

If reconfiguration fails for some reason, try to remove 'CMakeCache.txt' from the build directory

– Configuring incomplete, errors occurred!
See also "D:/b/CMakeFiles/CMakeOutput.log".
See also "D:/b/CMakeFiles/CMakeError.log".
CMake Error at D:/qt6-src/qtbase/cmake/QtProcessConfigureArgs.cmake:676 (message):
CMake exited with code 1.

```