OK, let's try another approach - include <linux/if.h> rather than

<net/if.h>, in the hope that

	1) doing so won't cause some problem somewhere

and

	2) it'll have multiple-include protection

(this whole "glibc is a separate project from the kernel, so we'll
duplicate header files" thing has its downsides).

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 1.166 .
+# From configure.in Revision: 1.167 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61.
 #
@@ -6602,11 +6602,6 @@ echo "$as_me: error: cannot determine linux version when cross-compiling" >&2;}
 echo "$as_me: error: version 2 or higher required; see the INSTALL doc for more info" >&2;}
    { (exit 1); exit 1; }; }
 	fi
-	#
-	# First try configuring without <net/if.h>, and then try with
-	# <net/if.h>; in some kernel versions, linux/wireless.h includes
-	# net/if.h, and in other versions, it doesn't.
-	#
 
 for ac_header in linux/wireless.h
 do
@@ -6624,6 +6619,7 @@ cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
 
 #include <sys/socket.h>
+#include <linux/if.h>
 #include <linux/types.h>
 
 
@@ -6664,82 +6660,6 @@ if test `eval echo '${'$as_ac_Header'}'` = yes; then
 #define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
 _ACEOF
 
-else
-
-		#
-		# It didn't work without <net/if.h>; try it with
-		# <net/if.h>.
-		#
-		# Unset ac_cv_header_linux_wireless_h so we don't
-		# treat the previous failure as a cached value and
-		# suppress the next test.
-		#
-		{ echo "$as_me:$LINENO: Rechecking with some additional includes" >&5
-echo "$as_me: Rechecking with some additional includes" >&6;}
-		unset ac_cv_header_linux_wireless_h
-
-for ac_header in linux/wireless.h
-do
-as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
-{ echo "$as_me:$LINENO: checking for $ac_header" >&5
-echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6; }
-if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-#include <sys/socket.h>
-#include <net/if.h>
-#include <linux/types.h>
-
-
-#include <$ac_header>
-_ACEOF
-rm -f conftest.$ac_objext
-if { (ac_try="$ac_compile"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_compile") 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
-	 test ! -s conftest.err
-       } && test -s conftest.$ac_objext; then
-  eval "$as_ac_Header=yes"
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-	eval "$as_ac_Header=no"
-fi
-
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-ac_res=`eval echo '${'$as_ac_Header'}'`
-	       { echo "$as_me:$LINENO: result: $ac_res" >&5
-echo "${ECHO_T}$ac_res" >&6; }
-if test `eval echo '${'$as_ac_Header'}'` = yes; then
-  cat >>confdefs.h <<_ACEOF
-#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-
-done
-
-
 fi
 
 done

configure.in

@@ -1,4 +1,4 @@
-dnl @(#) $Header: /tcpdump/master/libpcap/configure.in,v 1.166 2008-12-14 21:03:07 guy Exp $ (LBL)
+dnl @(#) $Header: /tcpdump/master/libpcap/configure.in,v 1.167 2008-12-14 22:00:57 guy Exp $ (LBL)
 dnl
 dnl Copyright (c) 1994, 1995, 1996, 1997
 dnl	The Regents of the University of California.  All rights reserved.
@@ -6,7 +6,7 @@ dnl
 dnl Process this file with autoconf to produce a configure script.
 dnl
 
-AC_REVISION($Revision: 1.166 $)
+AC_REVISION($Revision: 1.167 $)
 AC_PREREQ(2.50)
 AC_INIT(pcap.c)
 
@@ -357,32 +357,10 @@ linux)
 	if test $ac_cv_linux_vers -lt 2 ; then
 		AC_MSG_ERROR(version 2 or higher required; see the INSTALL doc for more info)
 	fi
-	#
-	# First try configuring without <net/if.h>, and then try with
-	# <net/if.h>; in some kernel versions, linux/wireless.h includes
-	# net/if.h, and in other versions, it doesn't.
-	#
-	AC_CHECK_HEADERS(linux/wireless.h, [],
-	[
-		#
-		# It didn't work without <net/if.h>; try it with
-		# <net/if.h>.
-		#
-		# Unset ac_cv_header_linux_wireless_h so we don't
-		# treat the previous failure as a cached value and
-		# suppress the next test.
-		#
-		AC_MSG_NOTICE([Rechecking with some additional includes])
-		unset ac_cv_header_linux_wireless_h
-		AC_CHECK_HEADERS(linux/wireless.h, [], [],
-		[
-#include <sys/socket.h>
-#include <net/if.h>
-#include <linux/types.h>
-		])
-	],
+	AC_CHECK_HEADERS(linux/wireless.h, [], [],
 	[
 #include <sys/socket.h>
+#include <linux/if.h>
 #include <linux/types.h>
 	])
 	AC_LBL_TPACKET_STATS

pcap-linux.c

@@ -34,7 +34,7 @@
 
 #ifndef lint
 static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/libpcap/pcap-linux.c,v 1.163 2008-12-14 20:30:11 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/libpcap/pcap-linux.c,v 1.164 2008-12-14 22:00:57 guy Exp $ (LBL)";
 #endif
 
 /*
@@ -93,21 +93,19 @@ static const char rcsid[] _U_ =
 #include <sys/ioctl.h>
 #include <sys/utsname.h>
 #include <sys/mman.h>
+#include <linux/if.h>
+#include <netinet/in.h>
+#include <linux/if_ether.h>
+#include <net/if_arp.h>
+#include <poll.h>
 
 /*
  * Got Wireless Extensions?
  */
 #ifdef HAVE_LINUX_WIRELESS_H
 #include <linux/wireless.h>
-#else
-#include <net/if.h>
 #endif
 
-#include <netinet/in.h>
-#include <linux/if_ether.h>
-#include <net/if_arp.h>
-#include <poll.h>
-
 #include "pcap-int.h"
 #include "pcap/sll.h"
 #include "pcap/vlan.h"