title: Compiling error in Mac OS X
body: <p>I am trying to compile a file in Mac OS X but keep on getting the error</p>
  
  <pre><code>Undefined symbols:
    "_main", referenced from:
        start in crt1.10.6.o
  ld: symbol(s) not found
  collect2: ld returned 1 exit status
  </code></pre>
  
  <p>Could any one help to find out what this error means?</p>