gentoo-overlay/net-misc/iperf/files/iperf-2.0.12-ipv6.patch

--- a/src/Listener.cpp
+++ b/src/Listener.cpp
@@ -670,6 +670,7 @@
 
     // Now optimize packet flow up the raw socket
     // Establish the flow BPF to forward up only "connected" packets to this raw socket
+#ifdef HAVE_IPV6
     if (l->sa_family == AF_INET6) {
 	struct in6_addr *v6peer = SockAddr_get_in6_addr(&server->peer);
 	struct in6_addr *v6local = SockAddr_get_in6_addr(&server->local);
@@ -682,9 +683,12 @@
 	    WARN_errno( rc == SOCKET_ERROR, "l2 v4in6 connect ip bpf");
 	}
     } else {
+#endif
 	rc = SockAddr_v4_Connect_BPF(server->mSock, ((struct sockaddr_in *)(l))->sin_addr.s_addr, ((struct sockaddr_in *)(p))->sin_addr.s_addr, ((struct sockaddr_in *)(l))->sin_port, ((struct sockaddr_in *)(p))->sin_port);
 	WARN_errno( rc == SOCKET_ERROR, "l2 connect ip bpf");
+#ifdef HAVE_IPV6
     }
+#endif
     if (rc < 0)
 	return -1;
     else