As far as I know, we don't, and I could not figure the package out (I could have
tried harder...).

And this highlights another big issue with our current build system: it's very
hard to know which file is already packaged.  It could very well be that some
texlive packages have conflicts simply because we've accidentally packaged the
same files in different packages.

-- 
Pierre Neidhardt
https://ambrevar.xyz/