/* Info about unsigned long long, falling back on unsigned long
if unsigned long long is not available. */
-#if HAVE_UNSIGNED_LONG_LONG_INT
+#if HAVE_UNSIGNED_LONG_LONG_INT && defined ULLONG_MAX
enum { BITS_PER_ULL = CHAR_BIT * sizeof (unsigned long long) };
# define ULL_MAX ULLONG_MAX
#else