{ mkDerivation, base, containers, exceptions, fetchurl
, monad-control, mtl, pipes, primitive, transformers
, transformers-base
}:
mkDerivation {
  pname = "pipes-safe";
  version = "2.2.6";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [
    base containers exceptions monad-control mtl pipes primitive
    transformers transformers-base
  ];
  description = "Safety for the pipes ecosystem";
  license = stdenv.lib.licenses.bsd3;
}