anchor.diff:      db4
       zeromq
       libsodium
  +    libb2
     ] ++ optionals withGui [
       qtbase
       qttools
  
positive.code: stdenv.mkDerivation rec {
  
    pname = "bitcoin" + toString (optional (!withGui) "d") + "-gold";
    version = "0.15.2";
  
    src = fetchFromGitHub {
      owner = "BTCGPU";
      repo = "BTCGPU";
      rev = "v${version}";
      sha256 = "0grd1cd8d2nsrxl27la85kcan09z73fn70ncr9km4iccaj5pg12h";
    };
  
    nativeBuildInputs = [
  
negative.code: , fetchFromGitHub
  , openssl
  , boost
  , libb2
  , libevent
  , autoreconfHook
  , db4
  