Upstream patch:

https://bugzilla.redhat.com/show_bug.cgi?id=706519

diff -up mrtg-2.16.4/bin/mrtg.orig mrtg-2.16.4/bin/mrtg

--- mrtg-2.16.4/bin/mrtg.orig	2010-12-13 14:26:25.000000000 +0100

+++ mrtg-2.16.4/bin/mrtg	2010-12-13 14:31:30.168311050 +0100

@@ -98,6 +98,7 @@ use locales_mrtg "0.07";

 BEGIN {

     if (eval {local $SIG{__DIE__};require Socket6;})  {

 	import Socket;

+	use Socket();

 	import Socket6

     }    

 }

diff -up mrtg-2.16.4/lib/mrtg2/SNMP_Session.pm.orig mrtg-2.16.4/lib/mrtg2/SNMP_Session.pm

--- mrtg-2.16.4/lib/mrtg2/SNMP_Session.pm.orig	2010-05-17 15:59:20.000000000 +0200

+++ mrtg-2.16.4/lib/mrtg2/SNMP_Session.pm	2010-12-13 14:26:25.366152933 +0100

@@ -146,7 +146,7 @@ BEGIN {

     if (eval {local $SIG{__DIE__};require Socket6;} &&

        eval {local $SIG{__DIE__};require IO::Socket::INET6; IO::Socket::INET6->VERSION("1.26");}) {

-	import Socket6;

+	Socket6->import(qw(pack_sockaddr_in6 inet_pton getaddrinfo));

 	$ipv6_addr_len = length(pack_sockaddr_in6(161, inet_pton(AF_INET6(), "::1")));

 	$SNMP_Session::ipv6available = 1;

     }

@@ -601,7 +601,7 @@ use Carp;

 BEGIN {

     if($SNMP_Session::ipv6available) {

 	import IO::Socket::INET6;

-	import Socket6;

+	Socket6->import(qw(pack_sockaddr_in6 inet_pton getaddrinfo));

     }

 }