title: Installing libv8 for ree on Mountain Lion fails
body: <p>I've been trying to find a solution to this for a few days now and no luck.  If anyone has been successful installing the libv8 gem for REE 1.8.7 on ML, could you please let me know the process you followed?  </p>
  
  <p>I have both the XCode LLVM compiler as well as the kennethreitz GCC package for 10.7+ v2 installed.</p>
  
  <p>The output when trying to install with native extensions is:</p>
  
  <pre>
  Building native extensions.  This could take a while...
  ERROR:  Error installing libv8:
      ERROR: Failed to build gem native extension.
  
          /Users/XXXXX/.rvm/rubies/ree-1.8.7-2012.02/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
      --without-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=/Users/XXXXX/.rvm/rubies/ree-1.8.7-2012.02/bin/ruby
  extconf.rb:13: uninitialized constant Gem (NameError)
  Checking for Python...
  
  Gem files will remain installed in /Users/XXXXX/.rvm/gems/ree-1.8.7-2012.02/gems/libv8-3.3.10.4 for inspection.
  Results logged to /Users/XXXXX/.rvm/gems/ree-1.8.7-2012.02/gems/libv8-3.3.10.4/ext/libv8/gem_make.out</pre>
  
  <p>(The results logged are the exact same as the error). </p>