I get this following when I try to install nokigiri,

Building native extensions. This could take a while...
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension. current directory: /var/lib/gems/2.4.0/gems/nokogiri-1.9.1/ext/nokogiri
/usr/bin/ruby2.4 -r ./siteconf20181224-15718-15hfw3z.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/nokogiri-1.9.1 for inspection.
Results logged to /var/lib/gems/2.4.0/extensions/x86_64-linux/2.4.0/nokogiri-1.9.1/gem_make.out

I have these version of ruby installed - 1.9.1, 2.0.0 and 2.4.0.

1 Answer

Installing ruby2.4-dev did the work.

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