Owncloud and memcached

I installed yesterday owncloud on a USB-drive connected to the raspberry pi.
Everything is working fine except I am not able to add the extension memcached (c.f :http://www.htpcguides.com/install-memcached-with-libmemcached-for-php5-fpm/)

I think there is a problem with the configuration of memcached but I’m not very comfortable with linux.

osmc@osmc:~$ sudo netstat -tap | grep memcached
tcp 0 0 osmc:11211 : LISTEN 2191/memcached
tcp6 0 0 [::]:11211 [::]:* LISTEN 1617/memcached

Thanks for your help.

You do not need memcached for this.

Sam