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Finally use __progname, err(3) and warn(3).
That's more readable and less error-prone than fumbling around
with argv[0], fprintf(3), strerror(3), perror(3), and exit(3).

It's a bad idea to boycott good interfaces merely because standards
committees ignore them.  Instead, let's provide compatibility modules
for archaic systems (like commercial Solaris) that still don't have
them.  The compat module has an UCB Copyright (c) 1993...

#include "config.h"

#if HAVE_ERR

int dummy;

#else

/* $Id: compat_err.c,v 1.1 2015/10/11 21:12:54 schwarze Exp $ */
/*
 * Copyright (c) 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.
 */

#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

extern char *__progname;

static void vwarni(const char *, va_list);
static void vwarnxi(const char *, va_list);

static void
vwarnxi(const char *fmt, va_list ap)
{
	fprintf(stderr, "%s: ", __progname);
	if (fmt != NULL)
		vfprintf(stderr, fmt, ap);
}

static void
vwarni(const char *fmt, va_list ap)
{
	int sverrno;

	sverrno = errno;
	vwarnxi(fmt, ap);
	if (fmt != NULL)
		fputs(": ", stderr);
	fprintf(stderr, "%s\n", strerror(sverrno));
}

void
err(int eval, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vwarni(fmt, ap);
	va_end(ap);
	exit(eval);
}

void
warn(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vwarni(fmt, ap);
	va_end(ap);
}

void
warnx(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vwarnxi(fmt, ap);
	va_end(ap);
	fputc('\n', stderr);
}

#endif