_ = code:ensure_loaded(unicode_util),
case erlang:function_exported(unicode_util, gc, 1) of
  true -> CONFIG;
  false ->
    [{pre_hooks, [{"(linux|darwin|solaris)", compile, "make -C uc_spec all"},
                  {"(freebsd|openbsd)", compile, "gmake -C uc_spec all"}]} | CONFIG]
end.