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

https://github.com/ndowens/void-packages procmail
https://github.com/void-linux/void-packages/pull/27573

procmail: switch distfiles to fossies
Seems upstream's source is unavailable
and homepage is blank

A patch file from https://github.com/void-linux/void-packages/pull/27573.patch is attached