anchor.diff:  { stdenv, fetchurl, fetchFromGitHub, python3, python3Packages, zbar, secp256k1
  +, enableQt ? !stdenv.isDarwin
   
   
   # for updater.nix
  
positive.code:     '';
      homepage = https://electrum.org/;
      license = licenses.mit;
      maintainers = with maintainers; [ ehmry joachifm np ];
    };
  }
  
negative.code: 
  let
    version = "3.3.8";
  
    libsecp256k1_name =
      if stdenv.isLinux then "libsecp256k1.so.0"
      else if stdenv.isDarwin then "libsecp256k1.0.dylib"
      else "libsecp256k1${stdenv.hostPlatform.extensions.sharedLibrary}";
  
    libzbar_name =
      if stdenv.isLinux then "libzbar.so.0"
      else "libzbar${stdenv.hostPlatform.extensions.sharedLibrary}";
  
    # Not provided in official source releases, which are what upstream signs.
    tests = fetchFromGitHub {
  