tar -zxvf memcached-3.0.3.tgz
cd memcached-3.0.3
phpize
yum install libmemcached libmemcached-dev
./configure --prefix=/usr/local/libmemcached/ --with-libmemcached-dir=/usr/local/libmemcached/ --with-php-config=/usr/local/php/bin/php-config
make && make install