There is an updated pull request by dkwo against master on the void-packages repository

https://github.com/dkwo/void-packages sioyek
https://github.com/void-linux/void-packages/pull/37912

new package: sioyek
Sioyek is a PDF viewer designed for reading research papers and technical books. https://sioyek.info/
I applied a patch from a PR to use system mupdf, otherwise it would build its own.
I translated their build_linux.sh into our qmake build helper.
Added required package mujs.

A patch file from https://github.com/void-linux/void-packages/pull/37912.patch is attached