Building native extensions. This could take a while...
ERROR: Error installing airplay:
ERROR: Failed to build gem native extension.
current directory: /var/lib/gems/2.3.0/gems/dnssd-3.0.1/ext/dnssd
/usr/bin/ruby2.3 -r ./siteconf20170402-2777-12pb7jn.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/dnssd-3.0.1 for inspection.
Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/dnssd-3.0.1/gem_make.out
$ gem install airplay
Building native extensions. This could take a while... ERROR: Error installing airplay: ERROR: Failed to build gem native extension.
/usr/bin/ruby2.3 -r ./siteconf20170402-2777-12pb7jn.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/dnssd-3.0.1 for inspection. Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/dnssd-3.0.1/gem_make.out