MAC SSH Raspberry Pi perl: warning: Falling back to the standard locale ("C").

If it happens when using SSH, this is a fault on the SSH client, not the RPi. For example using an Ubuntu machine as the SSH client will cause this problem.

To fix this SSH problem, edit the file /etc/ssh/ssh_config on the SSH client (not the RPi) and remove the line
SendEnv LANG LC_*

This stops the client sending invalid locale information to the RPi.

MAC下的ssh_config路徑為 /etc/ssh_config，將SendEnv LANG LC_*這一行注釋掉即可

From: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=50&t=11870