https://github.com/fgont/ipv6toolkit/commit/b3cb7be1820ca90c0ff10bc2924ec0585f89a098

--- tools/flow6.c.orig	Sun Apr  5 16:00:06 2015
+++ tools/flow6.c	Mon Apr 27 22:59:14 2015
@@ -681,7 +681,7 @@ int send_fid_probe(void){
 		dlt_null->family= PF_INET6;
 	}
 #if defined (__OpenBSD__)
-	else if(idata->type == DLT_LOOP){
+	else if(idata.type == DLT_LOOP){
 		dlt_null->family= htonl(PF_INET6);
 	}
 #endif