Perl スクリプトの実行時に、
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LC_ALL = (unset),
LC_COLLATE = "C",
LC_TIME = "C",
LANG = "ja_JP.EUC"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
といった警告メッセージが出る場合には、環境変数「PERL_BADLANG」に「0」を設定すれば消える。