PyTorch build and runs fine locally, but the CI consistently fails with error 
below. This issue has created unnecessary delays in merging new PT versions.

> 2023-03-18T18:24:32.7624930Z CMake Error at 
> third_party/fbgemm/CMakeLists.txt:76 (message):
> 2023-03-18T18:24:32.7638400Z   A compiler with AVX512 support is required.


A successful build uses:

> :debug:build CXX='/usr/bin/clang++'
> …
> :info:build -- Performing Test C_HAS_AVX512_2 - Success
> …
> :info:build -- Performing Test CXX_HAS_AVX512_2 - Success

I believe that the right compiler is set. Any suggestions, or does this 
complicated build fail with the CI box?

Details at this PR:

py-pytorch: Update to version 2.0.0 by essandess · Pull Request #18009 · 
macports/macports-ports
https://github.com/macports/macports-ports/pull/18009

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