Building on Windows11 Failed with missing ClangCL

When I build by executing python setup_env.py -md models/BitNet-b1.58-2B-4T -q i2_s:

Project "E:\Bitnet\BitNet\build\CMakeFiles\4.0.0-rc2\VCTargetsPath.vcxproj" on node 1 (default targets).
C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppBuild.targets(456,5): error MSB8020: The build tools for ClangCL (Platform Toolset = 'ClangCL') cannot be found. To build using the ClangCL build tools, please install ClangCL build tools. Alternatively, you may upgrade to the current Visual Studio tools by selecting the Project menu or right-click the solution, and then selecting "Retarget solution". [E:\Bitnet\BitNet\build\CMakeFiles\4.0.0-rc2\VCTargetsPath.vcxproj]
Done Building Project "E:\Bitnet\BitNet\build\CMakeFiles\4.0.0-rc2\VCTargetsPath.vcxproj" (default targets) -- FAILED.

I have installed Clang from official repository. And Clang-cl is in system PATH:

PS E:\Bitnet\BitNet> clang-cl.exe --version
clang version 20.1.3
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin

What should I do to continue the building process?

Start with setup_env.py and the CMake-generated VCTargetsPath.vcxproj referenced in the MSBuild error. Reproduce the command on Windows 11, inspect how the ClangCL toolset is selected, and verify the configured toolchain against clang-cl.exe --version. Done means the command completes without the missing ClangCL build-tools error.