title: An error occurred while installing eventmachine (1.0.3)
body: <p>I have Rails 4.2.5 and ruby 2.0.0 installed.</p>
  
  <p>This is a Gemfile of a project :</p>
  
  <pre><code>source 'https://rubygems.org'
  
  gem "whenever"
  
  gem "therubyracer"
  gem "less-rails"
  gem 'twitter-bootstrap-rails', :git =&gt; 'git://github.com/seyhunak/twitter-bootstrap-rails.git'
  
  gem 'geokit'
  
  gem 'sequenced'
  
  gem 'acts-as-taggable-on'
  
  gem 'bcrypt', :require =&gt; 'bcrypt'
  
  gem 'rack-cors', :require =&gt; 'rack/cors'
  
  # Paperclip
  gem "paperclip", "~&gt; 4.2"
  
  gem "thin"
  
  gem "passenger"
  
  gem 'geocoder'
  
  # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
  gem 'rails', '4.1.6'
  # Use sqlite3 as the database for Active Record
  gem 'mysql2'
  # Use SCSS for stylesheets
  gem 'sass-rails', '~&gt; 4.0.3'
  # Use Uglifier as compressor for JavaScript assets
  gem 'uglifier', '&gt;= 1.3.0'
  # Use CoffeeScript for .js.coffee assets and views
  gem 'coffee-rails', '~&gt; 4.0.0'
  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer',  platforms: :ruby
  
  # Use jquery as the JavaScript library
  gem 'jquery-rails'
  # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
  gem 'turbolinks'
  # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
  gem 'jbuilder', '~&gt; 2.0'
  # bundle exec rake doc:rails generates the API under doc/api.
  gem 'sdoc', '~&gt; 0.4.0',          group: :doc
  
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring',        group: :development
  </code></pre>
  
  <p>When I make bundle install I receive the following error : 
     "An error occurred while installing eventmachine (1.0.3), and Bundler cannot continue. Make sure that <code>gem install eventmachine -v '1.0.3'</code> succeeds before bundling."</p>
  
  <p>And if I make gem install eventmachine I have the following error</p>
  
  <pre><code>make "DESTDIR=" compiling binder.cpp
  In file included from binder.cpp:20:
  ./project.h:116:10: fatal error: 'openssl/ssl.h' file not found
  #include &lt;openssl/ssl.h&gt;
           ^
  1 error generated.
  make: *** [binder.o] Error 1
  Gem files will remain installed in        /Library/Ruby/Gems/2.0.0/gems/eventmachine-1.0.8 for inspection.
  Results logged to /Library/Ruby/Gems/2.0.0/gems/eventmachine-1.0.8/ext/gem_make.out
  </code></pre>
  
  <p>How Can I fix it?</p>