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-rw-r--r--src/systty.h5
1 files changed, 0 insertions, 5 deletions
diff --git a/src/systty.h b/src/systty.h
index ae98f123f2a..b660441a91e 100644
--- a/src/systty.h
+++ b/src/systty.h
@@ -47,11 +47,6 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#undef ASYNC
#endif
-/* Interrupt input is not used if there is no FIONREAD. */
-#ifndef FIONREAD
-#undef SIGIO
-#endif
-
/* Try to establish the correct character to disable terminal functions
in a system-independent manner. Note that USG (at least) define