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I am trying to install an instagram-crawler by using the gem command:

gem install instagram-crawler

But I am receiving the following error:

Building native extensions. This could take a while... ERROR: Error installing instagram-crawler: ERROR: Failed to build gem native extension.

current directory: /var/lib/gems/2.5.0/gems/nokogiri-1.10.1/ext/nokogiri /usr/bin/ruby2.5

-r ./siteconf20190205-5483-1zru4h.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/2.5.0/gems/nokogiri-1.10.1 for inspection. Results logged to /var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/nokogiri-1.10.1/gem_make.out

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I found a similar thread somewhere. A certain package was missing. By executing the following command everything is fixed:

sudo apt-get install ruby-dev

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I did

sudo apt-get install rubygems ruby-dev

and afterwards I was able to install my gem. I believe it will do the work for yours too.

I found the answer here: StackOverflow: Gem Command not found

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