title: bundle install / Error in Installing libv8 (3.3.10.4) on rails (running on Lion)
body: <p>I have added the gem 'sunspot_rails' in my gem file and ran bundle install. I have been getting errors in installing libv8 and the error message is as follows:</p>
  
  <pre><code>Installing libv8 (3.3.10.4) with native extensions 
  Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
  
          /opt/local/bin/ruby extconf.rb 
  *** extconf.rb failed ***
  Could not create Makefile due to some reason, probably lack of
  necessary libraries and/or headers.  Check the mkmf.log file for more
  details.  You may need configuration options.
  
  Provided configuration options:
      --with-opt-dir
      --with-opt-include
      --without-opt-include=${opt-dir}/include
      --with-opt-lib
      --without-opt-lib=${opt-dir}/lib
      --with-make-prog
      --without-make-prog
      --srcdir=.
      --curdir
      --ruby=/opt/local/bin/ruby
  extconf.rb:13: uninitialized constant Gem (NameError)
  Checking for Python...
  
  Gem files will remain installed in /Users/sonyakim/.rvm/gems/ruby-1.9.2-p290/gems/libv8-3.3.10.4 for inspection.
  Results logged to /Users/sonyakim/.rvm/gems/ruby-1.9.2-p290/gems/libv8-3.3.10.4/ext/libv8/gem_make.out
  An error occured while installing libv8 (3.3.10.4), and Bundler cannot continue.
  Make sure that `gem install libv8 -v '3.3.10.4'` succeeds before bundling.
  </code></pre>
  
  <p>When I run gem install libv8 -v '3.3.10.4', the following error message is printed:</p>
  
  <pre><code>Building native extensions.  This could take a while...
  ERROR:  Error installing libv8:
      ERROR: Failed to build gem native extension.
  
          /opt/local/bin/ruby extconf.rb
  *** extconf.rb failed ***
  Could not create Makefile due to some reason, probably lack of
  necessary libraries and/or headers.  Check the mkmf.log file for more
  details.  You may need configuration options.
  
  Provided configuration options:
      --with-opt-dir
      --with-opt-include
      --without-opt-include=${opt-dir}/include
      --with-opt-lib
      --without-opt-lib=${opt-dir}/lib
      --with-make-prog
      --without-make-prog
      --srcdir=.
      --curdir
      --ruby=/opt/local/bin/ruby
  extconf.rb:13: uninitialized constant Gem (NameError)
  Checking for Python...
  
  Gem files will remain installed in /Users/sonyakim/.rvm/gems/ruby-1.9.2-p290/gems/libv8-3.3.10.4 for inspection.
  Results logged to /Users/sonyakim/.rvm/gems/ruby-1.9.2-p290/gems/libv8-3.3.10.4/ext/libv8/gem_make.out
  </code></pre>
  
  <p>How can I install libv8 properly?</p>