Bundle install: ERROR: Failed to build gem native extension. nio4r gem

Question

I\'m currently working on a project using:

• rvm 1.26.11
• ruby 2.2.1p85

I tried to run bundle install but keep getting the follow

Answer 1

Works fine with macOS Sierra (10.12.2) after running the following command:

xcode-select --install

Before i had:

An error occurred while installing nio4r (1.2.1), and Bundler cannot continue.