(wait_reading_process_input): Use SIGIO only if defined.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/process.c b/src/process.c
index 4c2fa5d7c00..95d6846f9a3 100644
--- a/src/process.c
+++ b/src/process.c
@@ -3190,8 +3190,10 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
         /* System sometimes fails to deliver SIGIO.  */
         kill (getpid (), SIGIO);
 #endif
+#ifdef SIGIO
       if (XINT (read_kbd) && interrupt_input && (waitchannels & 1))
         kill (0, SIGIO);
+#endif
 
       /* If we have timed out (nfds == 0) or found some input (nfds > 0),
          we should exit.  */