LC configuration

[Zhu Sha Zang]

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How i can correct this:

/etc/cron.daily/man-db:
/usr/bin/mandb: can't set the locale; make sure $LC_* and $LANG are
correct
/etc/cron.daily/sysklogd:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "pt_BR"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "pt_BR"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

Thanks
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