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

mednafen: fix build, add ppc patches, altivec option
https://github.com/void-linux/void-packages/pull/13313
Description: 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.