title: Xcode - configure: error: no acceptable C compiler found in $PATH
body: <p>rebuilding a mac from scratch.  Installed xcode and rvm then trying to install rubies but they are all giving me:</p>
  
  <pre><code>Error running ' ./configure --prefix=/Users/durrantm/.rvm/rubies/ruby-1.9.3-p125 
  --enable-shared --disable-install-doc --with-libyaml 
  --with-opt-dir=/Users/durrantm/.rvm/usr ', 
  please read /Users/durrantm/.rvm/log/ruby-1.9.3-p125/configure.log
  There has been an error while running configure. Halting the installation.
  Michaels-MacBook-Air:~ durrantm$ 
  </code></pre>
  
  <p>The log has:</p>
  
  <pre><code>checking for gcc... no
  checking for cc... no
  checking for cl.exe... no
  configure: error: in `/Users/durrantm/.rvm/src/ruby-1.9.2-p290':
  configure: error: no acceptable C compiler found in $PATH
  </code></pre>
  
  <p>Do I need the gcc C compliler? How do I install it ?</p>