[Koha] memc missing

[Paul]

During checks prior to installing 3.4, I found:

paul at server2:~/koha3.4/koha-3.04.00.000$ ./koha_perl_deps.pl -u -m
Module Name                   Current Version      Required Version
Module Required
---------------------------------------------------------------------
CGI::Session::Driver::memc    0 *                  0.04
Graphics::Magick              1.3.12 *             1.3.5

Does anyone know where CGI::Session::Driver::memc might be found? I thought 
it could be libcache-memcached-perl but we seem to be up-to-date.

Many thanks,

Paul
Tired old sys-admin