--- loncom/homework/caparesponse/caparesponse.c	2024/04/29 00:22:49	1.22
+++ loncom/homework/caparesponse/caparesponse.c	2024/04/29 00:34:55	1.23
@@ -1,6 +1,6 @@
 /* The LearningOnline Network with CAPA 
  * CAPA wrapper code
- * $Id: caparesponse.c,v 1.22 2024/04/29 00:22:49 raeburn Exp $
+ * $Id: caparesponse.c,v 1.23 2024/04/29 00:34:55 raeburn Exp $
  *
  * Copyright Michigan State University Board of Trustees
  *
@@ -27,6 +27,7 @@
 
 #include <capaCommon.h>
 #include <ranlib.h>
+#include <ctype.h> /* isdigit() */
 
 PointsList_t * parse_pts_list (char *pts_list) {
   PointsList_t *new=NULL, *end=NULL, *beforeend=NULL, *rlist=NULL;