When I run perl, I get the warning:
perl
perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset
sudo nano /etc/locale.gen
Uncomment the locales you want to use (e.g. en_US.UTF-8 UTF-8):
en_US.UTF-8 UTF-8
Then run:
sudo /usr/sbin/locale-gen
Source: http://people.debian.org/~schultmc/locales.html