title: Installing Rails on Mavericks
body: <p>Not sure what happened but when I upgraded to Mavericks it says that Rails it not install. I executed the following command: </p>
  
  <pre><code>rails --version
  </code></pre>
  
  <p>And it said "Rails is not currently installed and run sudo gem install rails". </p>
  
  <p>I run sudo gem install rails and get the following: </p>
  
  <pre><code>ERROR:  Error installing rails:
      ERROR: Failed to build gem native extension.
  
      /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
  mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/include/ruby.h
  
  
  Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/json-1.8.1 for inspection.
  </code></pre>
  
  <p><strong>UPDATE:</strong> </p>
  
  <p>I ran the command gcc --version and got the following: </p>
  
  <pre><code>Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include/c++/4.2.1
  Apple LLVM version 5.0 (clang-500.2.76) (based on LLVM 3.3svn)
  Target: x86_64-apple-darwin13.0.0
  Thread model: posix
  </code></pre>