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 was with the same error just now.. In my case, I had installed the ruby through the package: https://www.brightbox.com/blog/2017/01/13/ruby-2-4-ubuntu-packages/

But, I had not installed the ruby-dev package.

In my case: sudo apt-get install ruby2.4-dev worked for me.

After installation I was able to compile the gem: nio4r

I think you have to install some package ruby-dev => sudo apt-get install ruby-dev