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    <p><strong>TL;DR:</strong> use <strong>bootstrap-sass</strong> gem instead (the rest of the answer below suggests <strong>bootstrap-rails</strong> gem, which is not as convenient, because then you need other dependencies, like LESS, and it gets a bit complicated.</p> <p>First of all, I should mention that there's more than one way to add Bootstrap to your app. I've tried the manual way first (which I suspect is what you're doing), and actually got into the same problem as you did (not sure if for the same cause or not). So then I've tried the recommended way, which is through a gem called <em>twitter-bootstrap-rails</em>. I followed this railscast:</p> <p><a href="http://railscasts.com/episodes/328-twitter-bootstrap-basics" rel="nofollow">http://railscasts.com/episodes/328-twitter-bootstrap-basics</a></p> <p>Then I ran into a problem, however, of not having another gem - <em>'less'</em>, which was causing a nasty runtime error. So I've added two more gems, for a total of three, to my Gemfile: - gem 'twitter-bootstrap-rails' - gem 'therubyracer' - gem 'less-rails' (missing this was the cause for the runtime error).</p> <p>Their exact role I am still not sure about -- but they play an important role in Rails asset pipeline. 'less' is what Bootstrap depends on, apparently, instead of 'sass', which Rails comes with.</p> <p>So, after installing them with <code>bundle install</code> -- those, and their other dependencies, most notable libv8 -- I've got Bootstrap working perfectly, including <code>&lt;i class="icon-share-alt"&gt;&lt;/i&gt;</code> =)</p>
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    1. COPS: this was the S/O link which describes the problem I ran into, and which suggested the solution: http://stackoverflow.com/questions/13888381/ruby-on-rails-error-cannot-load-such-file-less
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    2. COalex, thanks for the guidance. sounds like your suggestion is the right way to go (reinforced by tralston below). i watched the railscast you cited, but, being a newbie, i of course immediately wondered what i'm going to break if i just install the gem even though i have all these existing bootstrap files in my app. i'm going to just follow the instructions, though, and see what happens. hopefully i don't blow anything up too bad. thanks again.
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    3. CONo problem! I am actually learning Rails myself here... and I've just found another angle of attack. [See here] (http://ruby.railstutorial.org/chapters/filling-in-the-layout#top). It's a great (free) Rails book, which covers just enough of other things, from git to gems to bundle to rvm, to make a newbie comfortable. I really recommend it. But I digress - apparently, there *is* another Ruby gem, called _bootstrap-sass_, which is exactly what you need in order not to worry about installing _less_ (a gem native to Bootstrap, so to say).
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