Failed to build gem native extension when install RedCloth-4.2.9 install Linux

Question

I want to install Octopress in my computer. I try to do it like

Octopress document.

When I run

bundle install

Answer 1

it apears you are not using rvm for managing your ruby installation. I think best would be to try rvm, here's a very good guide, you can stop without installing rails: ruby with rvm

Then simply

$gem install RedCloth

Unmanaged ruby gems are a pain, I try to avoid them.

Answer 2

None of the answers worked on my Ubuntu 14.04.1 LTS. Upgrade to ruby 2.0 fixed the problem for me:

sudo apt-get install ruby2.0 ruby2.0-dev
sudo ln -s /usr/bin/ruby2.0 /usr/bin/ruby
sudo ln -s /usr/bin/gem2.0 /usr/bin/gem
sudo gem install bundler