Bundle Error

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /var/lib/gems/2.3.0/gems/nio4r-1.2.1/ext/nio4r
/usr/bin/ruby2.3 -r ./siteconf20170119-5608-xp6oe5.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.3.0/gems/nio4r-1.2.1 for
inspection.
Results logged to
/var/lib/gems/2.3.0/extensions/x86-linux/2.3.0/nio4r-1.2.1/gem_make.out

An error occurred while installing nio4r (1.2.1), and Bundler cannot
continue.
Make sure that `gem install nio4r -v '1.2.1'` succeeds before bundling.