[gcompris-devel] Need help with checking out voices

[Fòram na Gàidhlig]

I tried to check out the voices, so I can do my programming and testing. 
I followed the instructions on the Wiki 
http://gcompris.net/wiki/Voices_translation#From_the_source_code.

I get the same problem both with https://github.com/bdoin/GCompris.git 
or git://git.gnome.org/gcompris

Here's my terminal protocol:

~$ git clone -l GCompris voices
Cloning into 'voices'...
done.

~$ git checkout -b voices origin/voices
fatal: Not a git repository (or any of the parent directories): .git

~$ cd voices

~/voices$ git checkout -b voices origin/voices
fatal: git checkout: updating paths is incompatible with switching branches.
Did you intend to checkout 'origin/voices' which can not be resolved as 
commit?

Since this doesn't work, I fiddle around a bit:

~/voices$ git checkout -b origin/voices voices
fatal: git checkout: updating paths is incompatible with switching branches.
Did you intend to checkout 'voices' which can not be resolved as commit?

~/voices$ git checkout -b origin/voices
Switched to a new branch 'origin/voices'

Which gives me the main project instead of the voices files.

Does anybody know where the problem lies?