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

https://github.com/ericonr/void-packages makefile
https://github.com/void-linux/void-packages/pull/27005

Fix some gnu-makefile build style users
Mainly depends on the change from #27003 for CXXFLAGS inclusion.

A patch file from https://github.com/void-linux/void-packages/pull/27005.patch is attached