RTA_IFP removal: https://github.com/fgont/ipv6toolkit/pull/52

Other chunks: fix with -fno-common
https://github.com/fgont/ipv6toolkit/commit/2bde90f3845234490549640dc6ed5712d84969ba

Index: tools/libipv6.c
--- tools/libipv6.c.orig
+++ tools/libipv6.c
@@ -66,13 +66,9 @@
 
 
 /* IPv6 Address Resolution */
-sigjmp_buf			env;
-unsigned int		canjump;
+static sigjmp_buf			env;
+static unsigned int			canjump;
 
-/* pcap variables */
-char				errbuf[PCAP_ERRBUF_SIZE];
-struct bpf_program	pcap_filter;
-
 #ifdef __linux__
 /* Netlink requests */
 struct nlrequest{
@@ -517,6 +513,7 @@ int ether_pton(const char *ascii, struct ether_addr *e
 
 int find_ipv6_router_full(pcap_t *pfd, struct iface_data *idata){
 	struct pcap_pkthdr			*pkthdr;
+	struct bpf_program	pcap_filter;
 	const u_char				*pktdata;
 	struct ether_header			*pkt_ether;
 	struct ip6_hdr				*pkt_ipv6;
@@ -2815,7 +2812,7 @@ int sel_next_hop(struct iface_data *idata){
 		rtm->rtm_msglen= sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
 		rtm->rtm_version= RTM_VERSION;
 		rtm->rtm_type= RTM_GET;
-		rtm->rtm_addrs= RTA_DST | RTA_IFP;
+		rtm->rtm_addrs= RTA_DST;
 		rtm->rtm_pid= pid= getpid();
 		rtm->rtm_seq= seq= random();
 
@@ -4233,6 +4230,7 @@ int find_ipv6_router(pcap_t *pfd, struct ether_addr *h
 					struct ether_addr *result_ether, struct in6_addr *result_ipv6){
 
 	struct pcap_pkthdr			*pkthdr;
+	struct bpf_program			pcap_filter;
 	const u_char				*pktdata;
 	struct ether_header			*pkt_ether;
 	struct ip6_hdr				*pkt_ipv6;