having trouble loading certain optional modules

[btb at bitrate.net]

hi-

i see the following in the log file:

amavis[18551]: INFO: SA version: 3.3.2, 3.003002, no optional modules: auto::NetAddr::IP::Util::inet_n2dx auto::NetAddr::IP::Util::ipv6_n2d auto::NetAddr::IP::Util::ipv6_n2x

and would like to load those modules:

auto::NetAddr::IP::Util::inet_n2dx
auto::NetAddr::IP::Util::ipv6_n2d
auto::NetAddr::IP::Util::ipv6_n2x

but am having trouble.  i've installed libnetaddr-ip-perl [ubuntu], and have also installed NetAddr::IP::Util via the perl cpan shell [e.g. perl -MCPAN -e shell ] - but amavis still logs the above.  how can i correct this?

thanks
-ben