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Emacs 25.1 LANG Error

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perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LC_ALL = (unset),
    LANG = "en_JP.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").


;;(getenv "LANG")                       ; => "en_JP.UTF-8"
(setenv "LANG" "en_US.UTF-8")


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