CERNLIB Environment Variables Hook

doc/hooks/cernlib.section.md

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# CERNLIB {#cernlib-hook}

This hook sets the `CERN`, `CERN_LEVEL`, and `CERN_ROOT` environment variables. They are part of [CERNLIB's build system](https://cernlib.web.cern.ch/install/install.html) and are needed for some programs to compile correctly.

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Title: CERNLIB Environment Variables Hook

Summary

This hook configures the `CERN`, `CERN_LEVEL`, and `CERN_ROOT` environment variables. These variables are crucial components of CERNLIB's build system, ensuring that certain programs can compile successfully.