I follow next instructions to install memcached http://www.howtoforge.com/install-memcached-and-php5-memcached-module-on-debian-6.0-squeeze but I can not select it in W3 Total Cache settings.
phpinfo() shows that memcached is installed:
memcached support enabled
Version 1.0.2
libmemcached version 0.40
Session support yes
igbinary support no
php -modules shows memcached module in list
netstat -tap | grep memcached shows that port is opened
tcp 0 0 localhost.localdo:11211 *:* LISTEN
And I can connect to memcached port using telnet.
Why it not avaliable in W3 Total Cache?