Getting ready

First of all, install Xcode from the App Store, if you haven't installed it already. And then update the command-line tools with the following command:

$ xcode-select --install 

Also, we need to install Homebrew, a package manager for macOS, for that open terminal and type the following command:

$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"