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

Setting the bundle config didn't work for me...

If you've recently updated Xcode, make sure to actually run the application and accept the terms of service.

In my bundle error, I was getting You have to install development tools first.