title: Building Qt 4.8.1 from src on MacOS using gcc 4.5
body: <p>I have a question about building Qt SDK  4.8.1 using gcc on Mac. I need to use gcc 4.5 or higher, so I installed mp-gcc45 package using macports (so tried with mp-gcc47), selected this version of gcc, so </p>
  
  <pre><code>gcc -v 
  </code></pre>
  
  <p>Says me that gcc version 4.5.4 (MacPorts gcc45 4.5.4_6)</p>
  
  <p>So I downloaded QtSDK src from official site, configure it and there is an error at first step:</p>
  
  <pre><code>cc1plus: error: unrecognized command line option "-fconstant-cfstrings"
  </code></pre>
  
  <p>Maybe its stupid solution, but I remove this flags from configure file, so I get a error after make call:</p>
  
  <pre><code>g++: unrecognized option '-Xarch_x86_64'
  </code></pre>
  
  <p>Can you give me an advice, how to build Qt using this version of gcc?</p>