anchor.diff:        --replace "Exec=electron-cash" "Exec=$out/bin/electron-cash"
     '';
   
  +  # If secp256k1 wasn't added to the library path, the following warning is given:
  +  #
  +  #   Electron Cash was unable to find the secp256k1 library on this system.
  +  #   Elliptic curve cryptography operations will be performed in slow
  +  #   Python-only mode.
     postFixup = ''
  -    wrapQtApp $out/bin/electron-cash
  +    wrapQtApp $out/bin/electron-cash \
  +      --prefix LD_LIBRARY_PATH : ${secp256k1}/lib
     '';
   
     doInstallCheck = true;
  
positive.code:     requests
      tlslite-ng
      qdarkstyle
  
      # plugins
      keepkey
  
negative.code: { lib, fetchFromGitHub, python3Packages, qtbase, wrapQtAppsHook, secp256k1 }:
  
  python3Packages.buildPythonApplication rec {
    pname = "electron-cash";
    version = "4.0.14";
  
    src = fetchFromGitHub {
      owner = "Electron-Cash";
      repo = "Electron-Cash";
      rev = version;
      sha256 = "1dp7cj1185h6xfz6jzh0iq58zvg3wq9hl96bkgxkf5h4ygni2vm6";
    };
  
    propagatedBuildInputs = with python3Packages; [
  