perl: warning: Falling back to the standard locale ("C").

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 *   perl: warning: Falling back to the standard locale ("C").
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1. How to fix a locale setting warning from Perl?
    http://stackoverflow.com/questions/2499794/how-to-fix-a-locale-setting-warning-from-perl

If you are creating a rootfs using debootstrap you will need to generate the locales. You can do this by running:
    sudo locale-gen en_US.UTF-8
This tip comes from, https://help.ubuntu.com/community/Xen
On Debian you may need to do $ echo en_US UTF-8 >> /etc/locale.gen first.

root@zengjf:# echo en_US UTF-8 >> /etc/locale.gen
root@zengjf:# locale-gen en_US.UTF-8
Generating locales (this might take a while)...
  en_US.UTF-8... done
  Generation complete.
root@zengjf:#