[PATCH] fix build on uClibc without IPv6 support

Disable IPv6 support code when building with uClibc configured without IPv6
support.

[Gustavo: update for iproute2 3.10.0]
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura iproute2-3.10.0.orig/ip/ip6tunnel.c iproute2-3.10.0/ip/ip6tunnel.c
--- iproute2-3.10.0.orig/ip/ip6tunnel.c	2013-08-14 09:17:56.538089916 -0300
+++ iproute2-3.10.0/ip/ip6tunnel.c	2013-08-14 09:18:02.952298534 -0300
@@ -20,6 +20,10 @@
  *	Masahide NAKAMURA @USAGI
  */

+#include <features.h>
+#if defined(__UCLIBC__) && !defined (__UCLIBC_HAS_IPV6__)
+#else
+
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -425,3 +429,5 @@
 	fprintf(stderr, "Command \"%s\" is unknown, try \"ip -f inet6 tunnel help\".\n", *argv);
 	exit(-1);
 }
+
+#endif /* no ipv6 */
diff -Nura iproute2-3.10.0.orig/ip/ipprefix.c iproute2-3.10.0/ip/ipprefix.c
--- iproute2-3.10.0.orig/ip/ipprefix.c	2013-08-14 09:17:56.539089949 -0300
+++ iproute2-3.10.0/ip/ipprefix.c	2013-08-14 09:19:29.065099291 -0300
@@ -23,11 +23,18 @@
  *	Masahide NAKAMURA @USAGI
  */

+#include <features.h>
+#if defined(__UCLIBC__) && !defined (__UCLIBC_HAS_IPV6__)
+#define NO_IPV6
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/socket.h>
+#ifndef NO_IPV6
 #include <netinet/icmp6.h>
+#endif

 #include "utils.h"
 #include "ip_common.h"
@@ -65,10 +72,12 @@
 		fprintf(stderr, "incorrect protocol family: %d\n", prefix->prefix_family);
 		return 0;
 	}
+#ifdef ND_OPT_PREFIX_INFORMATION
 	if (prefix->prefix_type != ND_OPT_PREFIX_INFORMATION) {
 		fprintf(stderr, "wrong ND type %d\n", prefix->prefix_type);
 		return 0;
 	}
+#endif

 	parse_rtattr(tb, RTA_MAX, RTM_RTA(prefix), len);

diff -Nura iproute2-3.10.0.orig/ip/iptunnel.c iproute2-3.10.0/ip/iptunnel.c
--- iproute2-3.10.0.orig/ip/iptunnel.c	2013-08-14 09:17:56.538089916 -0300
+++ iproute2-3.10.0/ip/iptunnel.c	2013-08-14 09:18:02.953298566 -0300
@@ -9,6 +9,10 @@
  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  *
  */
+#include <features.h>
+#if defined(__UCLIBC__) && !defined (__UCLIBC_HAS_IPV6__)
+#define NO_IPV6
+#endif

 #include <stdio.h>
 #include <stdlib.h>
@@ -634,8 +638,10 @@
 	 * protocol-independent because of unarranged structure between
 	 * IPv4 and IPv6.
 	 */
+#ifndef NO_IPV6
 	case AF_INET6:
 		return do_ip6tunnel(argc, argv);
+#endif
 	default:
 		fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
 		exit(-1);