Can't instal cpan modules - 'make' not working - MacOS X

I am having difficulty installing some cpan modules as part of the  
ASSP anti-spam application. I am running under MacOS X 10.3.9 and  
have installed the developer tools (XCode). I did 'sudo -s' first,  
then csh, then:

setenv MANPATH /usr/share/man
cpan Net::RBLClient

It goes for a while and downloads the module, but has problems  
installing it:

  CPAN.pm: Going to build A/AB/ABLUM/Net-RBLClient-0.2.tar.gz

Warning: prerequisite Net::DNS::Packet 0 not found.
Writing Makefile for Net::RBLClient
---- Unsatisfied dependencies detected during
[A/AB/ABLUM/Net-RBLClient-0.2.tar.gz] -----
     Net::DNS::Packet
Shall I follow them and prepend them to the queue
of modules we are processing right now? [yes]
Running make test
   Delayed until after prerequisites
Running make install
   Delayed until after prerequisites
Running install for module Net::DNS::Packet

   The module Net::DNS::Packet isn't available on CPAN.

   Either the module has not yet been uploaded to CPAN, or it is
   temporary unavailable. Please contact the author to find out
   more about the status. Try 'i Net::DNS::Packet'.
Running make for A/AB/ABLUM/Net-RBLClient-0.2.tar.gz
   Is already unwrapped into directory
/Users/jlbrown/.cpan/build/RBLCLient-0.2

   CPAN.pm: Going to build A/AB/ABLUM/Net-RBLClient-0.2.tar.gz

     -- NOT OK
Running make test
   Can't test without successful make
Running make install
   make had returned bad status, install seems impossibe

Does anyone have any ideas on how I can get this to work?

Thanks,

James.

PS. Sorry if it is a real newbie question!