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No need for err.h, avoid excess fputs() calls and return from main
instead of calling exit().  From Michael Reed.

/*
 * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
 */

#include <sys/param.h>	/* MACHINE MACHINE_ARCH */

#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static void usage(void);

static int machine;

int
main(int argc, char *argv[])
{
	extern char *__progname;
	int short_form = 0, c;
	char *arch, *opts;

	setlocale(LC_ALL, "");

	machine = strcmp(__progname, "machine") == 0;
	if (machine) {
		arch = MACHINE;
		opts = "a";
		short_form = 1;
	} else {
		arch = MACHINE_ARCH;
		opts = "ks";
	}
	while ((c = getopt(argc, argv, opts)) != -1)
		switch (c) {
		case 'a':
			arch = MACHINE_ARCH;
			break;
		case 'k':
			arch = MACHINE;
			break;
		case 's':
			short_form = 1;
			break;
		default:
			usage();
			/* NOTREACHED */
		}
	if (optind != argc) {
		usage();
		/* NOTREACHED */
	}
	if (!short_form)
		fputs("OpenBSD.", stdout);
	puts(arch);
	return 0;
}

static void
usage(void)
{
	if (machine)
		fprintf(stderr, "usage: machine [-a]\n");
	else
		fprintf(stderr, "usage: arch [-ks]\n");
	exit(1);
}