ERROR: Failed to build gem native extension.

While attempting to install a package from gem, I encountered this issue:

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

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
	from extconf.rb:2:in `
' Gem files will remain installed in /var/lib/gems/1.9.1/gems/eventmachine-1.2.3 for inspection. Results logged to /var/lib/gems/1.9.1/gems/eventmachine-1.2.3/ext/gem_make.out

Simply to solve this you just need to install ruby-dev packages on ubuntu:

sudo apt-get install ruby-dev

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