To follow along with the examples in this book you will need Ruby version 2.1.7 or greater. You will then need the latest Compass and Sass gems. The Compass gem will install Sass also. You will also need NodeJS and npm. Npm will come built in with NodeJS. Any version after 4.2.1 will do. Finally, you will need Bower which can be installed through npm.
Not to worry…in Chapter 1, Requirements, we will cover installing Ruby, Compass, Sass, and NodeJS.