Ruby 1.9.1 Require Cannot Load Such Fiie
Running gem install [whatever] returns an error along the lines of
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
Install Ruby 1.9.1-dev...
sudo apt-get install ruby1.9.1-dev
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