There's a closed pull request on the void-packages repository

gzdoom: fix depends for audio
https://github.com/void-linux/void-packages/pull/20665

Description:
GZDoom needs libopenal, or FMOD [https://zdoom.org/wiki/Compile_GZDoom_on_Linux#Install_dependencies] to have sound playback. FMOD is not in the Void repo, so adding OpenAL as a dependency is a cheap workaround.