[IRIX4]: Include unistd.h.

diff --git a/src/systty.h b/src/systty.h
index a2800944126846d37da8c4d5fb19fb2da180055f..bb24a7aedb2586e1aaa11da0271d8f8e6a63ed4d 100644 (file)
--- a/src/systty.h
+++ b/src/systty.h
@@ -107,6 +107,11 @@ static struct sensemode {
 #include <unistd.h>
 #endif /* AIX */
 
+#ifdef IRIX4
+/* Get _getpty prototype */
+#include <unistd.h>
+#endif
+
 #ifdef SYSV_PTYS
 #include <sys/types.h>
 #include <sys/tty.h>