Debian JSON for Ruby

I tried to install JSON for Ruby via RubyGem,

# gem install json

and I got the following error message:

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


/usr/bin/ruby1.8 extconf.rb install json
extconf.rb:1:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:1

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/json-1.1.6 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/json-1.1.6/ext/json/ext/generator/gem_make.out

However, I found out in Debian, we can just install this library libjson-ruby:

$ sudo apt-get install libjson-ruby

Now, try to verify if it works:

$ irb
irb(main):001:0> require 'json'
=> true
irb(main):002:0>

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