2 files changed, 8 insertions, 0 deletions

diff --git a/src/s/bsd4-2.h b/src/s/bsd4-2.h
index ea9334c520c..ab8b7fbdd9a 100644
--- a/src/s/bsd4-2.h
+++ b/src/s/bsd4-2.h
@@ -126,3 +126,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
    is named _avenrun.  */
 
 #define LDAV_SYMBOL "_avenrun"
+
+/* Send signals to subprocesses by "typing" special chars at them.  */
+
+#define SIGNALS_VIA_CHARACTERS
diff --git a/src/s/bsd4-3.h b/src/s/bsd4-3.h
index 22330ba85b0..4eb66dc4ffc 100644
--- a/src/s/bsd4-3.h
+++ b/src/s/bsd4-3.h
@@ -129,3 +129,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
    is named _avenrun.  */
 
 #define LDAV_SYMBOL "_avenrun"
+
+/* Send signals to subprocesses by "typing" special chars at them.  */
+
+#define SIGNALS_VIA_CHARACTERS