ruby 2.3.1p112 (2016-04-26) [x86-64-linux-gnu]

ERROR: Failed to build gem native extension.

current directory: /var/lib/gems/2.3.0./gems/nio4r-2.1.0/ext/nio4r/usr/bin/ruby2.3 -r ./siteconf20170726-93-g151dm.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-2.1.0 for inspection.
Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/nio4r-2.1.0/gem_make.out