{ mkDerivation, base, bytestring, fetchurl, gsasl, transformers }:
mkDerivation {
  pname = "gsasl";
  version = "0.3.6";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base bytestring transformers ];
  libraryPkgconfigDepends = [ gsasl ];
  homepage = "https://john-millikin.com/software/haskell-gsasl/";
  description = "Bindings for GNU libgsasl";
  license = stdenv.lib.licenses.gpl3;
}