After I was done with install Memcached on CentOS a while ago, I just know today that there are 2 different PECL modules. One is "Memcache PECL" while another is "Memcached PECL". The one I did before is "Memcache PECL", so, now, I try to install "Memcached PECL" which is newer and require libmemcached library. The content below is almost exactly to my previous Memcache PECL installed. Only a few changes to install Memcached PECL instead.