o [libpcap] Added a --disable-packet-ring option to force the use of

an older, slower packet capture mechanism on Linux. Before Linux
  2.6.27, the packet ring mechanism uses different-sized kernel
  structures on 32- and 64-bit architectures, so a 32-bit program will
  not run correctly on a 64-bit kernel. The older mechanism does not
  have this flaw.

libpcap/configure

@@ -596,6 +596,7 @@ ac_subst_vars='LTLIBOBJS
 INSTALL_DATA
 INSTALL_SCRIPT
 INSTALL_PROGRAM
+PCAP_SUPPORT_PACKET_RING
 CAN_SRC
 PCAP_SUPPORT_CAN
 BT_SRC
@@ -702,6 +703,7 @@ with_snf_includes
 with_snf_libraries
 enable_bluetooth
 enable_can
+enable_packet_ring
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1335,6 +1337,7 @@ Optional Features:
                           available]
   --enable-can            enable CAN support [default=yes, if support
                           available]
+  --enable-packet-ring    enable Linux packet ring support [default=yes]
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -7179,6 +7182,21 @@ $as_echo "$as_me: no CAN sniffing support implemented for $host_os" >&6;}
 	esac
 
 
+fi
+
+# Check whether --enable-packet-ring was given.
+if test "${enable_packet_ring+set}" = set; then :
+  enableval=$enable_packet_ring;
+else
+  enable_packet_ring=yes
+fi
+
+
+if test "x$enable_packet_ring" != "xno" ; then
+
+$as_echo "#define PCAP_SUPPORT_PACKET_RING 1" >>confdefs.h
+
+
 fi
 
 # Find a good install program.  We prefer a C program (faster),