I tried to install Ruby selenium-webdriver but I got this error:sudo gem install selenium-webdriver[sudo] password for sam: Building native extensions.  This could take a while...ERROR:  Error installing selenium-webdriver:    ERROR: Failed to build gem native extension.    current directory: /var/lib/gems/2.4.0/gems/ffi-1.9.18/ext/ffi_c/usr/bin/ruby2.4 -r ./siteconf20170509-10458-cbn64m.rb extconf.rbmkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.hextconf failed, exit code 1Gem files will remain installed in /var/lib/gems/2.4.0/gems/ffi-1.9.18 for inspection.Results logged to /var/lib/gems/2.4.0/extensions/x86_64-linux/2.4.0/ffi-1.9.18/gem_make.outI've tried different methods that I found from different forums but they didn't work for me.Ruby version is 2.4 and Ubuntu version is 16.04
Ruby Selenium-Webdriver
ubuntu;selenium