cpan upgrade : installation errors

[Bruno Costacurta <techie@costacurta.org>]

Hello,

I installed cpan in my home directory. Debian is Lenny.
I start it via 'sudo cpan' and try 'upgrade' but got many identical errors :
Hereafter I only show error for one module, but all modules got same error.

cpan[3]> upgrade
..
Running install for module 'Socket'
The most recent version "1.94" of the module "Socket"
is part of the perl-5.13.11 distribution. To install that, you need to run
   force install Socket   --or--
   install F/FL/FLORA/perl-5.13.11.tar.gz
Running make test
   Can't test without successful make
Running make install
   Make had returned bad status, install seems impossible
..etc..

Perl version is 5.10,but cpan mentions perl-5.13.
Is it possible there is conflict between Debian package for Perl, and  
CPAN installation ?

Basically a Perl installation under Debian should be only made from packages ?
Or only from Perl sources ? So avoiding conflics between both sources ?

Thanks for attention.


Thanks for clarification and help.
Bye,
Bruno