anchor.diff:  
     getCoreSrc = core:
       fetchFromGitHub (builtins.getAttr core hashesFile);
  -
   in
   with lib.licenses;
  -
   {
  -
     atari800 = mkLibRetroCore rec {
       core = "atari800";
       src = getCoreSrc core;
  
positive.code: }:
  
  let
  
    d2u = lib.replaceChars [ "-" ] [ "_" ];
  
    mkLibRetroCore =
  
negative.code:     extraBuildInputs = [ libGL libGLU ];
      makefile = "Makefile";
      makeFlags = [ "HAVE_VULKAN=1" "HAVE_OPENGL=1" "HAVE_HW=1" "HAVE_LIGHTREC=1" ];
    };
  
    beetle-saturn = mkLibRetroCore {
      core = "mednafen-saturn";
      src = getCoreSrc "beetle-saturn";
      description = "Port of Mednafen's Saturn core to libretro";
  