<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/58966>58966</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            OpenMP found but omp.h missing error in Pixman
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          ms178
      </td>
    </tr>
</table>

<pre>
    As first reported in https://github.com/llvm/llvm-project/issues/58941#issuecomment-1312080062, Pixman errors out with LLVM-git main due to missing omp.h since the OpenMP changes on that day (as it did work okay with a build from a day before that):

```
WARNING: OpenMP found but omp.h missing.
Run-time dependency OpenMP found: NO (tried system)

pixman/meson.build:398:2: ERROR: Dependency "openmp" not found, tried system
```

[meson-log.txt](https://github.com/llvm/llvm-project/files/9998626/meson-log.txt)

This reproduces with 378778a0d10c2f8d5df8ceff81f95b6002984a4b. Also note, that a brand new 0.64 meson is used on my system.

This is my LLVM-configuration: 
[PKGBUILD.txt](https://github.com/llvm/llvm-project/files/9998643/PKGBUILD.txt)

My custom llvm-toolchain can be found here: https://github.com/ms178/archpkgbuilds/tree/main/toolchain-experimental/llvm-git
</pre>
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