Load a locale from /usr/local/share/locale in OS X
This worked for me (macos 10.14):

sudo localedef -i /usr/share/locale/en_US.UTF-8 /usr/local/share/locale/en_US.utf8
sudo cp /usr/share/locale/en_US.UTF-8/LC_COLLATE /usr/local/share/locale/en_US.utf8/