After runner update to Mac OS 14: glm.hpp include file (part of glm package installed using homebrew) not found

[tobbi]

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I'm currently working on upgrading our runner to MacOS 14 due to the recent brownout that we've experienced. In order to facilitate that, I've changed our code to reflect that change:

See https://github.com/SuperTux/supertux/pull/3414/files for the code changes we made to our CI files.

However, after updating, I keep getting an error because a certain include that belong to a dependency I've previously installed using homebrew can no longer be found. The error is:

 /Users/runner/work/supertux/supertux/src/math/vector.hpp:21:10: fatal error: 'glm/glm.hpp' file not found
#include <glm/glm.hpp>
         ^~~~~~~~~~~~~
1 error generated.

This worked previously, so I have no idea why this suddenly started to not work.

[tobbi]

We identified the issue together with copilot. So all is good now.