How to fix a bundle install “nio4r error” on Rails 5.0.0

Question

The exact error is:

An error occurred while installing nio4r (1.2.1), and bundler cannot continue. Make sure that \'gem install nio4r -v \'1.2.1\'\' succeeds         


        

Answer 1

I resolved the issue by running the following command.

bundle config build.nio4r --with-cflags="-std=c99"
bundle