title: android-ndk-r6-crystax-2 error: 'string' in namespace 'std' does not name a type
body: <p>I have a project that builds fine with android-ndk-r4-crystax but when that I switched to android-ndk-r6-crystax I get the following error:</p>
  
  <pre><code>error: 'string' in namespace 'std' does not name a type
  </code></pre>
  
  <p>Anybody have any ideas on what the difference between crystax r4 and r6 that would cause this issue?</p>