[root@march vhcs2-2.4.7.1]# perl -V:d_setlocale
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LC_COLLATE = "C",
        LANG = "en_US.utf8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
d_setlocale='define';