args @ { fetchurl, ... }:
rec {
  baseName = ''flexi-streams'';
  version = ''1.0.15'';

  description = ''Flexible bivalent streams for Common Lisp'';

  deps = [ args."trivial-gray-streams" ];

  src = fetchurl {
    url = ''http://beta.quicklisp.org/archive/flexi-streams/2015-07-09/flexi-streams-1.0.15.tgz'';
    sha256 = ''0zkx335winqs7xigbmxhhkhcsfa9hjhf1q6r4q710y29fbhpc37p'';
  };

  overrides = x: {
    postInstall = ''
        echo "$CL_SOURCE_REGISTRY"
        NIX_LISP_PRELAUNCH_HOOK='nix_lisp_run_single_form "(asdf:load-system :flexi-streams)"' "$out/bin/flexi-streams-lisp-launcher.sh" ""
    '';
  };
}