anchor.diff:      src = getCoreSrc "mupen64plus";
       description = "Libretro port of Mupen64 Plus, GL only";
       license = lib.licenses.gpl3Only;
  -
       extraBuildInputs = [ libGLU libGL libpng nasm xorg.libX11 ];
       makefile = "Makefile";
     };
  
positive.code:       # make -C 3rdparty/genie/build/gmake.linux -f genie.make obj/Release/src/host/lua-5.3.0/src/lgc.o
        mkdir -p 3rdparty/genie/build/gmake.linux/obj/Release/src/host/lua-5.3.0/src
      '';
    };
  
    mesen = mkLibRetroCore {
  
negative.code:     license = "MAME";
      makefile = "Makefile";
      makeFlags = lib.optionals stdenv.hostPlatform.isAarch64 [ "PTR64=1" "ARM_ENABLED=1" "X86_SH2DRC=0" "FORCE_DRC_C_BACKEND=1" ];
      enableParallelBuilding = false;
    };
  
    mame2015 = mkLibRetroCore {
  