masahi commented on issue #12987:
URL: https://github.com/apache/tvm/issues/12987#issuecomment-1269137655

   It compiles fine on my environment using clang 14. Maybe the older Apple 
clang doesn't have complete support for `std::optional`. If you google "error: 
'value' is unavailable: introduced in macOS 10.13" you see many reports.
   
   ```
   % clang --version
   Homebrew clang version 14.0.6
   Target: arm64-apple-darwin21.3.0
   Thread model: posix
   InstalledDir: /opt/homebrew/opt/llvm/bin
   % which clang
   /opt/homebrew/opt/llvm/bin/clang
   ```


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