{ mkDerivation, base, fetchurl }:
mkDerivation {
  pname = "microlens";
  version = "0.4.8.1";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base ];
  homepage = "http://github.com/aelve/microlens";
  description = "A tiny lens library with no dependencies. If you're writing an app, you probably want microlens-platform, not this.";
  license = stdenv.lib.licenses.bsd3;
}