title: Could not find heroku (>= 0) amongst [] (Gem::LoadError)
body: <p>Ug. I just moved from a Windows 7 installation to a Lion system. I'm attempting to teach myself Ruby on Rails, and whilst I like the language, the environment feels fragile and mysterious. I used the same command to install heroku on both systems, but the System X system is not happy with the install. </p>
  
  <p>On System X I used rvm, which might be my problem. </p>
  
  <p>What controls where Gems are installed?</p>
  
  <p>How can I get heroku up and running? And what will prevent the next gem from getting lost?</p>
  
  <pre><code>$ sudo gem install heroku
  ...
  
  $ heroku -v
  
  ~/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find heroku (&gt;= 0) amongst [minitest-1.6.0, rake-0.8.7, rdoc-2.5.8] (Gem::LoadError)
      from /Users/aliwells26/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:256:in `to_spec'
      from /Users/aliwells26/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems.rb:1210:in `gem'
      from /Users/aliwells26/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/bin/heroku:18:in `&lt;main&gt;'
  
  $ gem environment
  RubyGems Environment:
    - RUBYGEMS VERSION: 1.8.11
    - RUBY VERSION: 1.9.2 (2011-07-09 patchlevel 290) [x86_64-darwin11.2.0]
    - INSTALLATION DIRECTORY: /Users/aliwells26/.rvm/gems/ruby-1.9.2-p290@rails3tutorial
    - RUBY EXECUTABLE: /Users/aliwells26/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
    - EXECUTABLE DIRECTORY: /Users/aliwells26/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/bin
    - RUBYGEMS PLATFORMS:
      - ruby
      - x86_64-darwin-11
    - GEM PATHS:
       - /Users/aliwells26/.rvm/gems/ruby-1.9.2-p290@rails3tutorial
       - /Users/aliwells26/.rvm/gems/ruby-1.9.2-p290@global
    - GEM CONFIGURATION:
       - :update_sources =&gt; true
       - :verbose =&gt; true
       - :benchmark =&gt; false
       - :backtrace =&gt; false
       - :bulk_threshold =&gt; 1000
    - REMOTE SOURCES:
       - http://rubygems.org/
  
  $ echo $PATH
  /Users/aliwells26/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/bin:/Users/aliwells26/.rvm/bin:/Users/aliwells26/.rvm/gems/ruby-1.9.2-p290/gems/rails-3.1.1/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/usr/local/git/bin:/usr/local/git/bin
  </code></pre>