Jacques PERON

Yes, I authorize the change to any license as long it may be used in KOReader.

What I don't understand is that, `gregoriotex` being loaded after `unicode-math`, it should overwrite `\Vbar`. As is, it doesn't work ; but if I put `\let\Vbar\undefined` just before loading `gregoriotex`,...

Please forget my last comment : I had commented out `\usepackage{unicode-math}`. So even undefining `\Vbar` doesn't solve the problem.

While investigating a little more, I saw that : - if I put `\gresimpledefbarredsymbol{V}{0.1em}` before `\begin{document}`, the problem appears ; - if I put it after `\begin{document}`, the problem disappears....

I can confirm that, when setting the environment variable `openout_any=a`, the first error disappears ; the second doesn't with the MWE, but as pandoc "stays" in the original folder, it...

My mistake, excuse me : the second error disappeared, not the first. You understood well !

I think so ; on the other hand, shouldn't this behaviour be considered as a Kpathsea bug ? The output directory isn't an arbitrary one, as the user explicitly indicates...

The problem doesn't occur while writing directly from lua code. Now I remember the problem had already occured when `\gabcsnippet` was introduced, hence PR #494. But since the compilation of...

The problem comes from fonts : `lyluatex` uses the mechanisms of lualatex to use system fonts (TrueType / OpenType). `fouriernc` and `inputenc` are "old" mechanisms of LaTeX, that aren't compatible.

You'll find [here](https://tex.stackexchange.com/questions/230268/new-century-schoolbook-font-in-lualatex) some ideas to replace `fouriernc` with lualatex. If it doesn't matter for you to use another font style than schoolbook, `libertine` is a beautiful and well-integrated font.