{ mkDerivation, aeson, base, bytestring, fetchurl, http-client
, http-client-tls, mtl
}:
mkDerivation {
  pname = "kraken";
  version = "0.1.0";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [
    aeson base bytestring http-client http-client-tls mtl
  ];
  description = "Kraken.io API client";
  license = stdenv.lib.licenses.mit;
}