- Don't use printf %n.

Index: doc/mkdefsinc.c
--- doc/mkdefsinc.c.orig
+++ doc/mkdefsinc.c
@@ -262,8 +262,9 @@ main (int argc, char **argv)
         }
       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));
+      monthoff = strchr (p, ' ') - p + 1;
       xfree (opt_date);
       opt_date = p;
     }