今天在64位centos5.6系统上编译PHP5.2.17报错
checking for MySQL support... yes, shared checking for specified location of the MySQL UNIX socket... no checking for the location of libz... no checking for MySQL UNIX socket location... /var/lib/mysql/mysql.sock configure: error: Cannot find libmysqlclient under /usr. Note that the MySQL client library is not bundled anymore! [root@zjlca mysql]#
经查，问题是64位系统中 libmysqlclient 默认安装到了 /usr/lib64/mysql/ 目录下
而/usr/lib 目录下没有相应文件，但是php编译时，要去 /usr/lib目录下查找
解决方法：
ln -s /usr/lib64/mysql/libmysqlclient.so.15.0.0 /usr/lib/libmysqlclient.so
转自：http://blog.sina.com.cn/s/blog_4b6636880100vqk5.html