anchor.diff:      };
       description = "SMS Plus GX libretro port";
       license = gpl2Plus;
  -  }).override {
  -    dontConfigure = true;
  -  };
  -
  -  snes9x = (mkLibRetroCore rec {
  +  };
  +
  +  snes9x = mkLibRetroCore rec {
       core = "snes9x";
       src = fetchFromGitHub {
         owner = "snes9xgit";
  
positive.code:     };
      description = "Gambatte libretro port";
      license = gpl2;
    }).override {
      dontConfigure = true;
    };
  
    genesis-plus-gx = (mkLibRetroCore {
      core = "genesis-plus-gx";
      src = fetchRetro {
        repo = "Genesis-Plus-GX";
  
negative.code:     };
      description = "FreeIntv libretro port";
      license = gpl3;
      makefile = "Makefile";
    };
  
    gambatte = mkLibRetroCore rec {
      core = "gambatte";
      src = fetchRetro {
        repo = core + "-libretro";
  