Note: This one may not affect you at all, if you own a MacBook with an English keyboard layout (and corresponding native language settings).
I however, bought a MacBook Pro with a German keyboard layout, and when using, for example ‘git pull’ on the command line I got this message:
$git pull
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_CTYPE = "UTF-8",
LANG = (unset)
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
I added this to my .bash_profile:
export LC_CTYPE=en_US.UTF-8 export LC_ALL=en_US.UTF-8
Problem gone — thanks to the folks at spindicator.com who solved this problem already.
Note, that you may want to put in other values, depending on your language preferences.
Ph values 
Thanks, solved the issue for me.