There is a new pull request by q66 against master on the void-packages repository

https://github.com/void-ppc/void-packages mednafen
https://github.com/void-linux/void-packages/pull/13313

mednafen: fix build, add ppc patches, altivec option
Previously, mednafen wouldn't even build (on any platform) because of the aclocal related issues and also that the libcdio option hasn't existed in it in ages (i.e. drop superfluous dependency and remove). So fixed that + added an altivec option for ppc (enabled by default on ppc64, otherwise disabled) and ppc64 elfv2 libco impl from bsnes/higan (mednafen uses a very old forked version of bsnes, but the backport works fine). Also fixed lint.

A patch file from https://github.com/void-linux/void-packages/pull/13313.patch is attached