libmysqlclient version

You probably know that the version number of the libmysqlclient.so library has changed from .16 to .18 in version 5.5.11 ... 
As result, binaries linked with libmysqlclient.so.16 do no longer work with 5.5.11 and +, so people have to do tricky workarounds such as: 

mysql开发库的版本号。

有的库，可能对已有的程序不兼容。