php安装memcached扩展：configure: error: no, libmemcached sasl support is not enabled
环境：contos 6.3 php 5.3.3
问题：
PHP安装 memcached 扩展遇到如下错误：
pecl install memcached
libmemcached directory [no]:
checking whether libmemcached supports sasl… no
configure: error: no, libmemcached sasl support is not enabled. Run configure with –disable-memcached-sasl to disable this check
ERROR: '/tmp/pear/temp/memcached/configure –with-libmemcached-dir=no' failed查看 libmemcached 安装路径：
# find /usr -name memcached.h
/usr/local/include/libmemcached-1.0/memcached.h
/usr/local/include/libmemcached-1.0/struct/memcached.h
/usr/local/include/libmemcached/memcached.h指定 libmemcached directory 路径得到如下错误：
# pecl install memcached
libmemcached directory [no]:/usr/local/include/libmemcached
...
checking for libmemcached location... configure: error: Unable to find memcached.h under /usr/include/libmemcached解决方法：
- 安装
cyrus-**sasl**-devel
# yum install cyrus-sasl-devel- 再安装
memcached扩展（libmemcached安装时为默认配置，故不指定libmemcached directory路径）
pecl install memcached
libmemcached directory [no]:引用文章：