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johntmyers merged 1 commit into from
May 26, 2026
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docs: add macOS compiler troubleshooting #1569

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19 changes: 19 additions & 0 deletions CONTRIBUTING.md
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Expand Up @@ -126,6 +126,25 @@ Project requirements:
- Docker (running)
- Z3 solver library (for the policy prover crate)

### macOS build tools

Install Apple Command Line Tools before building locally:

```bash
xcode-select --install
```

If Cargo fails while building `protobuf-src` with an error such as
`fatal error: 'utility' file not found`, `fatal error: 'cstdlib' file not
found`, or `A compiler with support for C++11 language features is required`,
your Command Line Tools install may not expose the libc++ headers on the
compiler's default include path. Reinstall Command Line Tools to correct the error:

```bash
sudo rm -rf /Library/Developer/CommandLineTools
xcode-select --install
```

### Z3 installation

The `openshell-prover` crate links against the system Z3 library via pkg-config.
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