https://bugs.gentoo.org/326849

allow ipv6 to be disabled

--- a/ip/iptunnel.c
+++ b/ip/iptunnel.c
@@ -456,13 +456,6 @@ int do_iptunnel(int argc, char **argv)
 		break;
 	case AF_INET:
 		break;
-	/*
-	 * This is silly enough but we have no easy way to make it
-	 * protocol-independent because of unarranged structure between
-	 * IPv4 and IPv6.
-	 */
-	case AF_INET6:
-		return do_ip6tunnel(argc, argv);
 	default:
 		fprintf(stderr, "Unsupported family:%d\n", preferred_family);
 		exit(-1);
--- a/ip/Makefile
+++ b/ip/Makefile
@@ -1,6 +1,6 @@
 IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
-    rtm_map.o iptunnel.o ip6tunnel.o tunnel.o ipneigh.o ipntable.o iplink.o \
-    ipmaddr.o ipmonitor.o ipmroute.o ipprefix.o iptuntap.o \
+    rtm_map.o iptunnel.o tunnel.o ipneigh.o ipntable.o iplink.o \
+    ipmaddr.o ipmonitor.o ipmroute.o iptuntap.o \
     ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o \
     iplink_vlan.o link_veth.o link_gre.o iplink_can.o \
     iplink_macvlan.o iplink_macvtap.o ipl2tp.o
--- a/ip/ipmonitor.c
+++ b/ip/ipmonitor.c
@@ -76,7 +76,6 @@ int accept_msg(const struct sockaddr_nl *who,
 	if (n->nlmsg_type == RTM_NEWPREFIX) {
 		if (prefix_banner)
 			fprintf(fp, "[PREFIX]");
-		print_prefix(who, n, arg);
 		return 0;
 	}
 	if (n->nlmsg_type == RTM_NEWRULE || n->nlmsg_type == RTM_DELRULE) {