$NetBSD: patch-ab,v 1.2 2006/03/14 02:38:16 joerg Exp $

--- interfaces-bpf.cc.orig	2003-03-17 09:32:30.000000000 +0000
+++ interfaces-bpf.cc
@@ -15,6 +15,7 @@
     GNU General Public License for more details.
 ******************************************************************************/
 
+#include <assert.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <fcntl.h>
@@ -383,7 +384,11 @@ int BPFInterfaces::send_packet(int ifn, 
   /* write this packet: */
   iov[0].iov_base = (char* )&ether_packet;
   iov[0].iov_len = sizeof(ether_packet);
+#if defined(__DragonFly__)
+  iov[1].iov_base = (char *)data;
+#else
   iov[1].iov_base = data;
+#endif
   iov[1].iov_len = len;
   if (writev(_latd_bpf_fd, iov, 2) < 0) {
     syslog(LOG_ERR, "writev: %m");