--- ./doc/mkdefsinc.c.orig	2017-03-17 09:34:37.000000000 +0100
+++ ./doc/mkdefsinc.c	2021-12-27 23:14:49.542199850 +0100
@@ -286,8 +286,8 @@
         }
       n = strlen (opt_date) + strlen (month) + 2 + 1;
       p = xmalloc (n);
-      snprintf (p, n, "%d %n%s %d",
-                atoi (opt_date+8), &monthoff, month, atoi (opt_date));
+      snprintf (p, n, "%d %s %d",
+                atoi (opt_date+8), month, atoi (opt_date));
       xfree (opt_date);
       opt_date = p;
     }