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

If you are working on Mac OSX above version 10.11.x, the following approach worked for me:

gem install nio4r -v '1.1.0' -- with-cflags="-std=c99"