--- ./doc/mkdefsinc.c.orig	2021-09-01 10:39:31.217492425 +0200
+++ ./doc/mkdefsinc.c	2021-09-01 10:41:07.165492356 +0200
@@ -290,8 +290,8 @@
         }
       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;
     }