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

https://github.com/pbui/void-packages i8kutils
https://github.com/void-linux/void-packages/pull/27146

i8kutils: add missing acpi, tcl dependencies
i8kmon is a tcl script and thus needs tcl to run.  It also calls acpi to read the battery status.

A patch file from https://github.com/void-linux/void-packages/pull/27146.patch is attached