Dima Pasechnik

basically you can patch the doc/Makefile in pari to use xe(la)tex and be done with.

https://wiki.gentoo.org/wiki/TeX_Live#eselect_pdftex makes me wonder whether special steps are needed to enable/disable pdftex

I enabled xetex as it has better utf-8 support, I don't recall how; perhaps they don't function together?

OK, I reinstalled `dev-texlive/texlive-basic` (the package that contains `pdftex.fmt`) and now `pari 2.13` builds.

upgrade to Pari 2.13 does not change the picture.

in the 1st coredump in src/sage/doctest/test.py I see openblas, so it could be the Gentoo openblas upgrade to 3.12 (Sage is still on 3.9) that is responsible for this mess.

I can confirm that going back to openblas-0.3.9-r1 in my "vanilla" case fixes the problem.

this seems to be platform-dependent; on Homebrew one can use its OpenBLAS 3.12 with openmp in Sage just fine.

https://github.com/Homebrew/homebrew-core/blob/master/Formula/openblas.rb no patches as far as I can see

> Do you have `libgomp` linked into your build of `openblas` on homebrew? yes. It comes from gcc 10, by the way. I wonder whether your Gentoo tries come with...