title: Change OS X deployment target from 10.6 to 10.5 clang error
body: <p>I am trying to change my OS X project deployment target but i keep getting this error and my build fails. </p>
  
  <pre><code>clang: error: -fobjc-arc is not supported on current deployment target
  Command/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1
  </code></pre>
  
  <p>I have no clue what this means or what I have to do. </p>