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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.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/2.4.0/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.out

I'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

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  • You've tried different methods — but what were they? Commented May 9, 2017 at 1:04
  • I have tried: apt-get install ruby-dev , sudo gem update --system, sudo apt-get install make Commented May 9, 2017 at 1:30
  • That, as well as the contents of /var/lib/gems/2.4.0/extensions/x86_64-linux/2.4.0/ffi-1.9.18/gem_make.out, should be edited into the question Commented May 9, 2017 at 1:32
  • This one solved my problem: sudo apt-get install ruby2.4-dev Commented May 9, 2017 at 1:42
  • Interesting, considering that the unversioned -dev package didn't. Don't forget to post that as an answer! Commented May 9, 2017 at 1:45

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I tried this and it solved my problem:

sudo apt-get install ruby2.4-dev
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