pour ceux qui ont X11 d'installé sur leur machine, attention il y a un bug.Lorsque vous tapez svn help à la fin de l'installation, c'est comme ci le package svn n'étais pas installé, en fait il l'est!
pour résoudre ce probleme (Merci à Trond lossius):
to open Terminal, open preferences, and select the "Execute this command" and write /bin/bash into the text field, close, quit Terminal, start Terminal again and now type "svn help"__ Merci Guy pour cette note...

ou:
1. Open up terminal .app (this likely will bring you to your home directory)
2. Type 'nano .bash_profile' (this will open up a text file for you to edit, which might be blank)
3. Add the following line to the .bash_profile, followed by a blank line

alias svn='/usr/local/bin/svn'

4. Save the changes by hitting ctrl-o, then return
5. Exit nano by hitting ctrl-x
6. Quit the terminal, and then restart it
7. Type 'svn help' on the command line. If everything worked you will get some info