\f
/* Special cases - inhibiting the use of certain features. */
-/* Allow m- file to inhibit use of FIONREAD. */
+/* Allow configure to inhibit use of FIONREAD. */
#ifdef BROKEN_FIONREAD
#undef FIONREAD
#undef ASYNC
#endif
-/* Interrupt input is not used if there is no FIONREAD. */
-#ifndef FIONREAD
-#undef SIGIO
-#endif
-
\f
/* Try to establish the correct character to disable terminal functions
in a system-independent manner. Note that USG (at least) define