anchor.diff:  }:
   
   let
  -  version = "4.2.0";
  +  version = "4.3.1";
   
     libsecp256k1_name =
       if stdenv.isLinux then "libsecp256k1.so.0"
  
positive.code:     owner = "Groestlcoin";
      repo = "electrum-grs";
      rev = "refs/tags/v${version}";
      sha256 = "15n6snrs1kgdqkhp4wgs0bxxdz6mzl8dvf8h7s0jzc6r4b74vv3n";
    };
  
    nativeBuildInputs = lib.optionals enableQt [ wrapQtAppsHook ];
  
negative.code:   ];
  
    preBuild = ''
      substituteInPlace ./electrum_grs/ecc_fast.py \
        --replace ${libsecp256k1_name} ${secp256k1}/lib/libsecp256k1${stdenv.hostPlatform.extensions.sharedLibrary}
    '' + (if enableQt then ''
  