redis Module "rlm_redis" not available in Freeradius 2.2.5 ?

[tom greisch]

Hello everybody,
I try to install Freeradius on a Debian 8.0 Testmaschine.I used the Standard Packetmanager for Installation. So i got Freeradius 2.2.5.Authentication works against Active Directory -> everything OK 
After that i wanted to use the redis Module to cache AD User Groups. So i configured a Redis Server and the "../freeradius/modules/redis" File. 

But when i start Freeradius in debugging Mode i get the following Messages:
etc/freeradius/modules/redis[10]: Failed to link to module 'rlm_redis': file not found 
/etc/freeradius/sites-enabled/inner-tunnel[307]: Failed to find "redis" in the "modules" section.
/etc/freeradius/sites-enabled/inner-tunnel[263]: Errors parsing post-auth section. 

My Question is:
-Is the Redis Module (rlm_redis) not part of the standard Freeradius 2.2.5 Installation?