three18ti@aserver:~$ perlbrew list
  perl-5.18.4
* perl-5.18.4@three18ti
three18ti/@aserver:~$ which cpan
/opt/perlbrew/perls/perl-5.18.4/bin/cpan
three18ti@aserver:~$ cat /etc/*release*
Red Hat Enterprise Linux Server release 5.11 (Tikanga)

three18ti@aserver:~$ cpan
Terminal does not support AddHistory.
CPAN.pm panic: Found invalid lockfile '/home/three18ti/.cpan/.lock', please remove. Cannot proceed.

three18ti@aserver:~$ rm .cpan/.lock
three18ti@aserver:~$ cpan
Terminal does not support AddHistory.
CPAN: Time::HiRes loaded ok (v1.9725)
Could not lock lockfile with flock: No such file or directory; retrying
Could not lock lockfile with flock: No locks available; retrying