anchor.diff:  , fetchFromGitHub
   , openssl
   , boost
  +, libb2
   , libevent
   , autoreconfHook
   , db4
  
positive.code:     db4
      zeromq
      libsodium
    ] ++ optionals withGui [
      qtbase
      qttools
  
negative.code: stdenv.mkDerivation rec {
  
    pname = "bitcoin" + toString (optional (!withGui) "d") + "-gold";
    version = "0.17.3";
  
    src = fetchFromGitHub {
      owner = "BTCGPU";
      repo = "BTCGPU";
      rev = "v${version}";
      sha256 = "sha256-1tFoUNsCPJkHSmNRl5gE3n2EQD6RZSry1zIM5hiTzEI=";
    };
  
    nativeBuildInputs = [
  