Post: #2

mysql clients are designed to work better with their respective mysql server version, so you doesn't really need to install the latest available version, but the latest "recommended" version

I don't use linux so I can't confirm it, but sphere nightly compiler uses libmysqlclient18:i386 running on ubuntu 14.04 LTS (trusty). If you use an newest linux version you will only have libmysqlclient20 with no default support for older versions, so you must follow this readme guide to get back libmysqlclient18 https://github.com/Sphereserver/Source