Index: head/usr.sbin/config/mkheaders.c
===================================================================
--- head/usr.sbin/config/mkheaders.c	(revision 351088)
+++ head/usr.sbin/config/mkheaders.c	(revision 351089)
@@ -1,68 +1,68 @@
 /*-
  * SPDX-License-Identifier: BSD-3-Clause
  *
  * Copyright (c) 1980, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)mkheaders.c	8.1 (Berkeley) 6/6/93";
 #endif
 static const char rcsid[] =
   "$FreeBSD$";
 #endif /* not lint */
 
 /*
- * Make all the .h files for the optional entries
+ * This used to generate a bunch of hearders files related to devices when
+ * device counters were supported. Support for that was removed in 2005.
+ * Since then, all we've done is to report unknown devices in this file.
+ * It's kept its historical name, despite no longer generating headers.
  */
 
-#include <ctype.h>
 #include <err.h>
 #include <stdio.h>
-#include <string.h>
-#include <sys/param.h>
 #include "config.h"
 #include "y.tab.h"
 
 void
 headers(void)
 {
 	struct device *dp;
 	int errors;
 
 	errors = 0;
 	STAILQ_FOREACH(dp, &dtab, d_next) {
 		if (!(dp->d_done & DEVDONE)) {
 			warnx("Error: device \"%s\" is unknown",
 			       dp->d_name);
 			       errors++;
 			}
 	}
 	if (errors)
 		errx(1, "%d errors", errors);
 }