{ mkDerivation, base, bytestring, fetchurl }:
mkDerivation {
  pname = "unix-bytestring";
  version = "0.3.7.3";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base bytestring ];
  homepage = "http://code.haskell.org/~wren/";
  description = "Unix/Posix-specific functions for ByteStrings";
  license = stdenv.lib.licenses.bsd3;
}