ERROR: Failed to build gem native extension - Error installing mysql2

Question

error while running bundle install

Installing mysql2 (0.3.11) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native exte         


        

Answer 1

If the stack trace includes this error:

mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

Look at what version of ruby you're using with:

ruby -v

Then install the correct version of ruby dev that goes with your version of ruby:

sudo apt-get install ruby2.0-dev
sudo apt-get install ruby2.2-dev
sudo apt-get install ruby2.3-dev

Then:

gem install mysql2