Perl locale warnings on Debian

I'm getting this warning:

perl: warning: Please check that your locale settings:  
    LANGUAGE 开发者_如何学编程= (unset),  
    LC_ALL = (unset),
    LANG = "en_US.UTF-8"  
are supported and installed on your system.  

How can I fix this?

You need to set a locale, easiest may be adding

LANG=C

or

LANG=en_US

or whichever setting you like best in the file /etc/environment.

This usually only happens in very bare server environments or chroots.