$cd astyle/build/mac
$make
$bin/astyle
I cannot set native locale, reverting to English
astyle is testing the value of the LC_ALL environment variable. You can see its value with $ echo $LC_ALL: it most likely is empty.
A quick workaround is to do $ export LC_ALL="fr_FR.UTF-8" but Mac OS X can be a strange beast when it comes to environment variables. I'd suggest you read these three ressources:
http://www.dowdandassociates.com/content/howto-set-an-environment-variable-in-mac-os-x/
Setting environment variables in OS X?
https://superuser.com/questions/476752/setting-environment-variables-in-os-x-for-gui-applications