Howto install Razor2 plugin for SpamAssassin?

[Ger Apeldoorn]

> Try to shut down your amavisd server and run the following command:
>
> amavisd debug-sa

No, I saw this:
--------------------%<------------------------
[29655] dbg: plugin: loading Mail::SpamAssassin::Plugin::Razor2 from @INC
[29655] dbg: razor2: razor2 is not available
[29655] dbg: plugin: registered 
Mail::SpamAssassin::Plugin::Razor2=HASH(0xb50ecfc)
--------------------%<------------------------

That is strange isnt' it? I installed Mail::SpamAssassin::Plugin::Razor2 with 
CPAN and if I do "install Mail::SpamAssassin::Plugin::Razor2" again, it tells 
me that it is up-to-date.

Ger.