title: Lua - 'system' is unavailable: not available in iOS
body: <p>I have opened an IOS Objetive C project that uses Lua in xCode 9 (which was working in xCode 8) and I get the following error:</p>
  
  <pre><code>'system' is unavailable: not available in iOS
  </code></pre>
  
  <p><strong>ioslib.c</strong>
  <a href="https://i.stack.imgur.com/rT66V.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rT66V.png" alt="enter image description here"></a></p>
  
  <p>I know that 'system' is unavailable in iOS11 but how can I fix this issue with Lua?  This is a library that I have included and did not write myself.</p>