There is a new pull request by Liebach against master on the void-packages repository

https://github.com/Liebach/void-packages qmk-depend
https://github.com/void-linux/void-packages/pull/22363

Add cross-arm-none-eabi-newlib as qmk dependency.
Fixes building at least planck/rev6 firmware, possibly other keyboards
with ARM based controllers.

Found out with help from Discord users Erovia and fauxpark on the qmk server.

A patch file from https://github.com/void-linux/void-packages/pull/22363.patch is attached