Added SystemExit.
diff --git a/Include/errors.h b/Include/errors.h
index ce00e3e..1f7cfc3 100755
--- a/Include/errors.h
+++ b/Include/errors.h
@@ -46,6 +46,7 @@
 extern object *RuntimeError;
 extern object *SyntaxError;
 extern object *SystemError;
+extern object *SystemExit;
 extern object *TypeError;
 extern object *ValueError;
 extern object *ZeroDivisionError;