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    <p>I just figured this out, and I am so glad I did because I am using Devise for a production application that is being deployed to Tomcat, and bcrypt was causing me grief. ANYWAY, here's what you do:</p> <ol> <li>Make sure you are using a version of Ruby from <a href="http://rubyinstaller.org/downloads/" rel="nofollow">RubyInstaller</a> <ul> <li>Download and install which ever version of Ruby you want</li> <li>I should mention that I am using Ruby 1.8.7 and have not tested this for Ruby 1.9+</li> </ul></li> <li>Download the latest DevKit as well from <a href="http://rubyinstaller.org/downloads/" rel="nofollow">RubyInstaller</a>. <ul> <li>Extract DevKit, but do not set it up at this point</li> </ul></li> <li>Download and install JRuby</li> <li>At this point, both RubyInstaller Ruby and JRuby should be available on your path <ul> <li>A simple check would be is to open a command prompt window and type <ul> <li><code>jruby -v</code> outputs <code>jruby 1.5.5 (ruby 1.8.7 patchlevel 249) (2010-11-10 4bd4200) (Java HotSpot(TM) Client VM 1.6.0_21) [x86-java]</code></li> <li><code>ruby -v</code> outputs <code>ruby 1.8.7 (2010-08-16 patchlevel 302) [i386-mingw32]</code></li> </ul></li> </ul></li> <li><code>cd</code> to the directory where you extracted DevKit</li> <li>Type <code>ruby dk.rb init</code></li> <li><strong>IMPORTANT:</strong> Open <code>config.yml</code> and make sure that both your jruby and ruby installations are listed. If not, <strong>ADD</strong> them. Save and close <code>config.yml</code> after you're done.</li> <li>Back in your command prompt window, type <code>ruby dk.rb install</code>. This will install DevKit to all the ruby installations listed in your <code>config.yml</code>. Most important of all, <strong>IT WILL ALSO INSTALL IT INTO YOUR JRUBY INSTALLATION!</strong></li> <li><p>Once installation is done, give it a whirl by typing <code>jruby -S gem install bcrypt-jruby</code></p> <pre><code>C:\&gt;jruby -S gem install bcrypt-ruby --no-ri --no-rdoc JRuby limited openssl loaded. http://jruby.org/openssl gem install jruby-openssl for full support. Temporarily enhancing PATH to include DevKit... Building native extensions. This could take a while... Successfully installed bcrypt-ruby-2.1.2 1 gem installed </code></pre></li> </ol> <p>BINGO! BANGO!</p>
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    1. POJruby :- Unable to install devise on windows using jruby
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    1. USJohn
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