title: Ruby on Windows7 - could not find gem
body: <p>I'm setting up a ruby Apache Buildr on a fresh Windows 7 machine.
  I've installed Ruby, the DevKit and installed buildr via</p>
  
  <pre><code>    gem install buildr
  </code></pre>
  
  <p>wich all ran perfect.
  Until I tried to execute buildr, then I get an error.</p>
  
  <pre><code>    buildr compile
  
      C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find buildr (&gt;= 0) amongst [atoulme-Antwrap-0.7.1, builder-2.1.2, buildr-1.4.5-x86-mswin32, buildr-as3-0.2.12, diff-lcs-1.1.2,highline-1.5.1, hoe-2.3.3, json_pure-1.4.3, minitar-0.5.3, minitest-1.6.0, net-sftp-2.0.4, net-ssh-2.0.23, rake-0.8.7, rdoc-2.5.8, rjb-1.3.2-x86-mswin32-60, rspec-2.1.0, rspec-core-2.1.0,rspec-expectations-2.1.0, rspec-mocks-2.1.0, rubyforge-2.0.3, rubygems-update-1.8.4, rubyzip-0.9.4, xml-simple-1.0.12] (Gem::LoadError)
      from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:256:in `to_spec'
      from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems.rb:1182:in `gem'
      from C:/Ruby192/bin/buildr:18:in `&lt;main&gt;'
  </code></pre>
  
  <p>When I list all the gems with</p>
  
  <pre><code>   gem list buildr
  </code></pre>
  
  <p>Everything seems to match up, and this error makes no sense at all.
  <img src="https://i.stack.imgur.com/EWd5Q.png" alt="enter image description here"></p>
  
  <p>Any ideas?
  Help would be great, I'm getting desperate now. :)</p>