=> The Xcode Command Line Tools will be installed. It will prompt for sudo password(your mac/laptop password), enter it to proceed. Install Homebrew with: /bin/bash -c ' $(curl -fsSL )' Then it means you don't have it installed. Open your terminal and type this: $ brew -version The first thing is to ensure you have Homebrew installed. P.S: Ensure you have a strong network connection and alot of data haha General Homebrew General (For all platforms both iOS and Android).If you use Linux OS, I've written this one here for you This guide will walk you through with a straight to the point approach. So you have a new MacOS and now you want to set up React Native on your new machine. If you need to develop an app for both iOS and Android, React Native is the best tool out there.