[horde] passwd-5.0-git fail

[José Eduardo Martins]

Im am testing passwd-5.0-git. When I fill the form to change password  
I get these errors:

On the screen:
Um erro fatal ocorreu
imp is not activated.
Os detalhes foram gravados em log para o administrador.

On log:
2012-12-20T11:26:59-02:00 EMERG: HORDE-5.0 [passwd] imp is not  
activated. [pid 7745 on line 1457 of  
"/usr/share/pear/Horde/Registry.php"]

There is any way to make passwd work?

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Eduardo