There is a new pull request by arp242 against master on the void-packages repository

https://github.com/arp242/void-packages bsdgrep
https://github.com/void-linux/void-packages/pull/27997

New package: bsdgrep
This is "BSD grep" from the FreeBSD source tree, which is the default
grep in FreeBSD 13.

It should be pretty much a drop-in replacement for GNU grep, so I just
set it to replace/conflict with it. It installs a bunch of
commands/links, and I'm not sure if having them all as "bsd*grep*" and
updating alternatives is all that useful, but it could be done if people
feel strongly about this.

A patch file from https://github.com/void-linux/void-packages/pull/27997.patch is attached