There is an updated pull request by bra1nwave against master on the void-packages repository

https://github.com/bra1nwave/void-packages calibre
https://github.com/void-linux/void-packages/pull/16178

[WIP] calibre: backport patch to fix ebook-viewer
fixes https://github.com/void-linux/void-packages/issues/16146

A patch file from https://github.com/void-linux/void-packages/pull/16178.patch is attached