--- a
+++ b/compat/getopt.c
@@ -0,0 +1,116 @@
+/* $Id$ */
+
+/*
+ * Copyright (c) 1987, 1993, 1994
+ *	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.
+ */
+
+/* OPENBSD ORIGINAL: lib/libc/stdlib/getopt.c */
+
+#include "tmux.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int	BSDopterr = 1,		/* if error message should be printed */
+	BSDoptind = 1,		/* index into parent argv vector */
+	BSDoptopt,		/* character checked for validity */
+	BSDoptreset;		/* reset getopt */
+char	*BSDoptarg;		/* argument associated with option */
+
+#define	BADCH	(int)'?'
+#define	BADARG	(int)':'
+#define	EMSG	""
+
+/*
+ * getopt --
+ *	Parse argc/argv argument vector.
+ */
+int
+BSDgetopt(int nargc, char *const *nargv, const char *ostr)
+{
+	static char *place = EMSG;		/* option letter processing */
+	char *oli;				/* option letter list index */
+
+	if (ostr == NULL)
+		return (-1);
+
+	if (BSDoptreset || !*place) {		/* update scanning pointer */
+		BSDoptreset = 0;
+		if (BSDoptind >= nargc || *(place = nargv[BSDoptind]) != '-') {
+			place = EMSG;
+			return (-1);
+		}
+		if (place[1] && *++place == '-') {	/* found "--" */
+			if (place[1])
+				return (BADCH);
+			++BSDoptind;
+			place = EMSG;
+			return (-1);
+		}
+	}					/* option letter okay? */
+	if ((BSDoptopt = (int)*place++) == (int)':' ||
+	    !(oli = strchr(ostr, BSDoptopt))) {
+		/*
+		 * if the user didn't specify '-' as an option,
+		 * assume it means -1.
+		 */
+		if (BSDoptopt == (int)'-')
+			return (-1);
+		if (!*place)
+			++BSDoptind;
+		if (BSDopterr && *ostr != ':')
+			(void)fprintf(stderr,
+			    "%s: unknown option -- %c\n", __progname, BSDoptopt);
+		return (BADCH);
+	}
+	if (*++oli != ':') {			/* don't need argument */
+		BSDoptarg = NULL;
+		if (!*place)
+			++BSDoptind;
+	}
+	else {					/* need an argument */
+		if (*place)			/* no white space */
+			BSDoptarg = place;
+		else if (nargc <= ++BSDoptind) {	/* no arg */
+			place = EMSG;
+			if (*ostr == ':')
+				return (BADARG);
+			if (BSDopterr)
+				(void)fprintf(stderr,
+				    "%s: option requires an argument -- %c\n",
+				    __progname, BSDoptopt);
+			return (BADCH);
+		}
+	 	else				/* white space */
+			BSDoptarg = nargv[BSDoptind];
+		place = EMSG;
+		++BSDoptind;
+	}
+	return (BSDoptopt);			/* dump back option letter */
+}