memcached functions for mysql官网发布的1.1版本是09年的，只兼容libmemcached0.34版本。也不知道这东西还有没有人在更新。
于是看了下libmemcached 1.0.x的api和源码，修改了下memcached functions for mysql的源码，于是就可以用了。。。
ChangeLog
1.2 Tuesday, April 17,2012 18:00:00 EST 2012
* Added support of libmemcached above version 1.0
* fixed issue of libtool compling error
* Update memc_stats function to take 0 or 1 argument
* Added memc_servers_reset function
* Added memc_increment_by_key function
* Added memc_decrement_by_key function
* Added memc_flush function
* Added memc_flush_buffers function
* Removed memc_servers_behavior_set function
* Removed memc_servers_behavior_get function
* Fixed bugs of memc_behavior_set and memc_behavior_get
* Add behaviors as follows:
MEMCACHED_BEHAVIOR_NOREPLY
MEMCACHED_BEHAVIOR_TCP_KEEPALIVE
MEMCACHED_BEHAVIOR_TCP_KEEPIDLE
MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS
MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY
MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH
MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ
MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS
MEMCACHED_BEHAVIOR_DEAD_TIMEOUT