One way to fix - perl 'warning: Setting locale failed...' on mac

[Jacob Malte Jensen]

perl: warning: Setting locale failed.

perl: warning: Please check that your locale settings:

LANGUAGE = (unset),

LC_ALL = (unset),

LC_CTYPE = "UTF-8",

LANG = "en_US.iso885915"

    are supported and installed on your system.

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

Solution:

 

Open Terminal > Preferences > Advanced > Untick the 'Set locale environment variables on startup'.