Similar issue reported:

• http://www.nntp.perl.org/group/perl.ldap/2014/04/msg3761.html
• https://rt.cpan.org/Public/Bug/Display.html?id=9312

Seems compatibility of module releases in the IO::Socket::INET calls. While possible to rename INET6 module file, not suggested as fix in case of Perl apps requiring the IPv6 resolver. Could break something.. Next idea?