{ mkDerivation, base, fetchurl }:
mkDerivation {
  pname = "deque";
  version = "0.2";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base ];
  homepage = "https://github.com/nikita-volkov/deque";
  description = "Double-ended queue";
  license = stdenv.lib.licenses.mit;
}