Added 'optind' and 'optarg' as in adig.c.
#include <sys/types.h>
#if !defined(WIN32) || defined(WATT32)
+#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
+#endif
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
+#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
+#endif
#include <stdio.h>
#include <stdlib.h>
#include "inet_ntop.h"
#include "inet_net_pton.h"
+#ifndef optind
+extern int optind;
+extern char *optarg;
+#endif
+
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif