Perl Warning Message

After installing Helix GNOME, I get the following message when running any
Perl program:

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "(null)"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

What can I do to correct this?

TIA,
Nathan    

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