Perl modules


I just know that this is a newbie Perl question, however I will ask it anyway…

When trying to install RT, how do you make visible the CPAN-build perl
modules that has been created in the cpan directory in my home directory…?
Is there an environmental variable that need to be set…? Or so they need
to be placed in a special location…? Due to security reasons, I cannot
build RT as root.