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-rw-r--r--sys/dev/sio/sio.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index 35b6715..1d19344 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
- * $Id: sio.c,v 1.135 1996/02/25 21:10:54 bde Exp $
+ * $Id: sio.c,v 1.136 1996/03/27 20:03:24 bde Exp $
*/
#include "sio.h"
@@ -85,7 +85,9 @@
#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
#define RB_I_HIGH_WATER (TTYHOG - 2 * RS_IBUFSIZE)
+#ifndef RS_IBUFSIZE
#define RS_IBUFSIZE 256
+#endif
#define CALLOUT_MASK 0x80
#define CONTROL_MASK 0x60
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