install packages on local perl installation

Hello,

I've got a problem concerning two different perl installations on a
single sun ultra sparc.
One of them is under /home/se/sepubdb/local. Starting cpan it seems to
refer to the normal perl installation (/usr/local/bin/perl).

Is there a way to tell cpan that it should refer to the local user
installation under home/se... ? I only found a configuration file
under $HOME/.cpan/CPAN but I don't know if that's the right point to
start ?