anchor.diff:      description = "Port of Hatari to libretro";
       license = lib.licenses.gpl2Only;
       extraBuildInputs = [ SDL zlib ];
  -    extraNativeBuildInputs = [ cmake which ];
  -    dontUseCmakeConfigure = true;
  +    extraNativeBuildInputs = [ which ];
       dontConfigure = true;
       makeFlags = [ "EXTERNAL_ZLIB=1" ];
  -    depsBuildBuild = [ stdenv.cc ];
     };
   
     mame = mkLibRetroCore {
  
positive.code:     src = getCoreSrc core;
      description = "Neko Project II kai libretro port";
      license = lib.licenses.mit;
      makefile = "Makefile.libretro";
      makeFlags = [
        # See https://github.com/AZO234/NP2kai/tags
        "NP2KAI_VERSION=rev.22"
  
negative.code:     description = "Port of MAME to libretro";
      license = with lib.licenses; [ bsd3 gpl2Plus ];
      extraBuildInputs = [ alsa-lib libGLU libGL portaudio python3 xorg.libX11 ];
    };
  
    mame2000 = mkLibRetroCore {
  