Update: I managed to get it installed using: perl -MCPAN::FirstTime -e 'CPAN::FirstTime::init()'
but it still doesn't work, because the next two things I tried were:

# perl -MCPAN -e install Bundle::libnet
# perl -MCPAN -e install Date/Parse.pm

Each time it simply returned to the command line, which made me wonder if it had already been installed, so I tried running a .pl script but got:
Can't locate Date/Parse.pm in @INC (@INC contains: /opt/csw/lib/perl/5.8.8 /opt/csw/share/perl/5.8.8 /opt/csw/lib/perl/site_perl /opt/csw/share/perl/site_perl /opt/csw/share/perl/site_perl /opt/csw/lib/perl/csw /opt/csw/share/perl/csw /opt/csw/share/perl/csw .) at ./2md.pl line 131.

BEGIN failed--compilation aborted at ./2md.pl line 131.

Does any know?