title: QtCreator build system is broken after OSX upgrade
body: <p>I recently upgraded my OSX to mountain lion and ever since I cannot compile my project using Qt Creator anymore. I get bunch of errors like the following:</p>
  
  <p><code>/Users/user/codes/lib/io/xdmfWriter.cpp:63: error: explicit instantiation of 'std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::basic_string&lt;_CharT, _Traits, _Alloc&gt;&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;, _Alloc = std::allocator&lt;char&gt;]' but no definition available</code></p>
  
  <p><code>/Users/user/codes/lib/io/xdmfWriter.cpp:-1: In instantiation of 'std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::basic_string&lt;_CharT, _Traits, _Alloc&gt;&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;, _Alloc = std::allocator&lt;char&gt;]':</code></p>
  
  <p><code>/Users/user/codes/lib/io/xdmfWriter.cpp:63: instantiated from here</code></p>
  
  <pre><code>// xdmfWriter.cpp -- line 63:
  gridName &lt;&lt; xdmfName_ &lt;&lt; "." &lt;&lt; timeStep;
  </code></pre>
  
  <p><code>gridName</code> is a <code>std::ostringstream</code> object and <code>xdmfName_</code> is a <code>std::string</code> variable declared as a private member of the <code>xdmfWriter</code> class and initialized in the class constructor. I did not have this problem before ... Any ideas?</p>