title: cannot install Ruby 1.9.3 in OSX 10.13.6
body: <p>I tried <code>rvm install 1.9.3</code> but got the following errors:</p>
  
  <pre><code>+requirements_osx_brew_update_system:8&gt; typeset 'ret=1'
  +requirements_osx_brew_update_system:9&gt; rvm_error $'\nXcode version older than 4.6.2 installed, download and install newer version from:\n\n    http://connect.apple.com\n\nAfter installation open Xcode, go to Downloads and install Command Line Tools.\n'
  +rvm_error:2&gt; rvm_pretty_print stderr
  +rvm_pretty_print:2&gt; case auto (0|no)
  +rvm_pretty_print:2&gt; case auto (1|auto)
  +rvm_pretty_print:7&gt; case xterm-256color (dumb|unknown)
  +rvm_pretty_print:10&gt; case stderr (stdout)
  +rvm_pretty_print:10&gt; case stderr (stderr)
  +rvm_pretty_print:12&gt; [[ -t 2 ]]
  +rvm_pretty_print:12&gt; return 1
  +rvm_error:4&gt; printf %b $'\nXcode version older than 4.6.2 installed, download and install newer version from:\n\n    http://connect.apple.com\n\nAfter installation open Xcode, go to Downloads and install Command Line Tools.\n\n'
  
  Xcode version older than 4.6.2 installed, download and install newer version from:
  
      http://connect.apple.com
  
  After installation open Xcode, go to Downloads and install Command Line Tools.
  
  +requirements_osx_brew_update_system:16&gt; return 1
  </code></pre>
  
  <p>My xcode version is Version 10.1 so I don't think that's the reason.
  My guess is that my current xcode is too new for ruby 1.9.3.</p>
  
  <p>Is there a walkaround?</p>