*** src/main/http_main.c.orig	Fri Jul 13 00:36:35 2001
--- src/main/http_main.c	Fri Jul 13 01:28:14 2001
***************
*** 3335,3340 ****
--- 3335,3359 ----
  	    exit(1);
      }
  
+     /* USAGI needs IPV6_V6ONLY socket option to bind a port only
+      * IPv6. 
+      * This code is tested under Linux 2.2.19+USAGI 20010709 SNAP.
+      * 2001.07.13. NISHI Takao <zophos@Dadd9.com>
+      */
+     #ifdef INET6
+     if(server->sa_family==AF_INET6){
+ 	int on=1;
+ 	if (setsockopt(s,IPPROTO_IPV6,IPV6_V6ONLY,
+ 		       (char *)&on,sizeof(on))==-1){
+ 	    ap_log_error(APLOG_MARK, APLOG_CRIT, server_conf,
+ 		    "make_sock: failed to set a socket option for %s", addr);
+ 	    close(s);
+ 	    ap_unblock_alarms();
+ 	    exit(1);
+ 	}
+     }
+     #endif
+ 
      /* Solaris (probably versions 2.4, 2.5, and 2.5.1 with various levels
       * of tcp patches) has some really weird bugs where if you dup the
       * socket now it breaks things across SIGHUP restarts.  It'll either