On 29/07/2023 06:46, LARONDE Thierry wrote:
> I suppose that this behavior is in LaTeX code, not an engine?

No, as I have said multiple times this is not a latex issue.

that text is from texlive's texmf.cnf documenting the engine level
kpathsea search options.

That is,  it is documenting C code not macros.

David



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