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I've been getting this error inside emacs (flycheck) which is trying to call chktex with --verbosity=0
Suspicious state from syntax checker tex-chktex: Flycheck checker tex-chktex returned 1, but its output contained no errors: chktex: ERROR -- Illegal verbosity level.The solution is to install texlive-binextra, where it installs a default chktexrc file in /usr/share as well as /etc/texmf.
So I dug around in the chktex code and it seems like it needs a default chktexrc file, which isn't installed by default with texlive-bin (even though chktex is).
I then did some digging, and apparently the old texlive-core used to have this file (according to yay -F chktexrc) in the 2022 distribution. I then downloaded the pkgbuild for the latest texlive-core, which got renamed to texlive-basic, which actually has a shared PKGBUILD called texlive-texmf, which splits this file out into texlive-binextra.
In case anyone else runs into this (doing a websearch for this error didn't seem to help).
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