[08:25][nick:~]$ perlbrew list
* perl-5.6.0
  perl-5.16.0
[08:25][nick:~]$ perl -v | head -2

This is perl, v5.6.0 built for darwin
[08:25][nick:~]$ cpan Test::More
Going to read '/Users/nick/.cpan/Metadata'
...

##</code><code>##

...
All tests successful.
Files=118, Tests=1378,  9 wallclock secs ( 0.53 usr  0.39 sys +  5.34 cusr  2.15 csys =  8.41 CPU)
Result: PASS
  EXODIST/Test-Simple-1.001014.tar.gz
  make test -- OK
Running make install
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ERROR: Can't create '/Library/Perl/5.12'
Do not have write permissions on '/Library/Perl/5.12'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 at -e line 1
make: *** [pure_site_install] Error 13
  EXODIST/Test-Simple-1.001014.tar.gz
  make install  -- NOT OK

##</code><code>##

[08:26][nick:~]$ cpanm Test::More
Not a CODE reference at /Users/nick/perl5/perlbrew/bin/cpanm line 507.
BEGIN failed--compilation aborted at /Users/nick/perl5/perlbrew/bin/cpanm line 507.