--- ./libdnet-stripped/configure.orig	2010-05-07 23:08:32.000000000 +0200
+++ ./libdnet-stripped/configure	2011-01-29 22:22:39.000000000 +0100
@@ -14342,11 +14342,8 @@
     if test "${ac_cv_dnet_bsd_bpf+set}" = set; then
   $as_echo_n "(cached) " >&6
 else
-  if test -c /dev/bpf0 ; then
-	    ac_cv_dnet_bsd_bpf=yes
-	else
-	    ac_cv_dnet_bsd_bpf=no
-	fi
+# PR ports/154353 : support building in FreeBSD jail
+    ac_cv_dnet_bsd_bpf=yes
 fi
 
     { $as_echo "$as_me:$LINENO: result: $ac_cv_dnet_bsd_bpf" >&5