With Perlbrew, go ahead and do fresh installs of perl. That way Perlbrew can easily switch between them. 
$ perlbrew available
  perl-5.17.1
  perl-5.16.0
  perl-5.14.2
  perl-5.12.4
  perl-5.10.1
  perl-5.8.9
  perl-5.6.2
  perl5.005_04
  perl5.004_05
  perl5.003_07
$ perlbrew install perl-5.16.0

[download]

Also, is this a machine that many people use or is it your personal machine? By default, perlbrew installs itself and perl in your home directory, so you don't need to ever use sudo when adding new modules; however, for our shared workhorse, I follow the docs at http://perlbrew.pl to install into /perlbrew so that everyone is able to use the modules I install.

In reply to Re^3: duplicate perl environments by frozenwithjoy
in thread duplicate perl environments by Bejjan

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