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Github provides you with all sources:

You can get and compile the mednafen stuff with:
cd RetroPie/emulatorcores
git clone –depth=0 git://
cd mednafen-libretro
export FLAGS=”-march=armv6zk -mfpu=vfp -mfloat-abi=hard”
make platform=armv

There should be some libretto*.so file now. Otherwise compilation failed.

Start retroarch with your new core:
RetroPie/emulators/RetroArch/installdir/bin/retroarch -Lfind RetroPie/emulatorcores/mednafen-libretro/ -name “*libretro*.so” | head -1--config $rootdir/configs/all/retroarch.cfg

Don’t no if it is working.