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

https://github.com/ndowens/void-packages EternalTerminal
https://github.com/void-linux/void-packages/pull/17831

EternalTerminal: Remove manual compile flag
Re-edited CMakeLists.txt and sources to compile
with or without libexecinfo if system supports it
instead of using case to add or not add.

This is how I have the PR setup for both the ET upstream and
their vendor-ed dependency (easylogging)

Signed-off-by: Nathan Owens <ndowens04@gmail.com>

A patch file from https://github.com/void-linux/void-packages/pull/17831.patch is attached