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 ### Backend
 - [Command Line Tools for Xcode](https://developer.apple.com/download/all/?q=command%20line%20tools) (on OSX) or [TDM-GCC](https://jmeubank.github.io/tdm-gcc/download/) (on Windows) (a `make` executable mandatory)
 - [Golang1.19.1](https://golang.org/dl/) (mandatory, in China please try a mirror site like [that of ustc](https://mirrors.ustc.edu.cn/golang/))
-- [MySQL 5.7](https://dev.mysql.com/downloads/windows/installer/5.7.html) (mandatory)
+- [MySQL 5.7](https://dev.mysql.com/downloads/windows/installer/5.7.html) (mandatory, for OSX not all versions of 5.7 can be found thus 5.7.24 is recommended)
 - [Redis 3.0.503 or above](https://redis.io/download/) (mandatory)
 - [skeema](https://www.skeema.io/) (optional, only for convenient MySQL schema provisioning)
 - [protobuf CLI](https://developers.google.com/protocol-buffers/docs/downloads) (optional, only for development)