{ mkDerivation, base, fetchurl, old-time }:
mkDerivation {
  pname = "mersenne-random";
  version = "1.0.0.1";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base old-time ];
  homepage = "http://code.haskell.org/~dons/code/mersenne-random";
  description = "Generate high quality pseudorandom numbers using a SIMD Fast Mersenne Twister";
  license = stdenv.lib.licenses.bsd3;
}