title: Qt app 64-bit architecture error
body: <p>I'm working on Qt and adding slots to my Qt Gui application is giving out the following error.</p>
  
  <pre><code> symbol(s) not found for architecture x86_64.
  </code></pre>
  
  <p>when i comment out the <code>slots</code> block everything seems fine.</p>
  
  <pre><code>public slots:
  </code></pre>
  
  <p>Is there some kind of bug in QtCreator or am I doing something wrong.</p>
  
  <p>I'm using Qt Creator 2.5.2 based on Qt 4.8.3(64-Bit) on Mac Osx 10.8 (mountain lion)</p>
  
  <p><code>Edit:</code> Here is my full class</p>
  
  <pre><code>#include &lt;QMainWindow&gt;
  #include "qextserialport.h"
  
  namespace Ui {
  class MainWindow;
  }
  
  class MainWindow : public QMainWindow
  {
      Q_OBJECT
  
  public:
      explicit MainWindow(QWidget *parent = 0);
      ~MainWindow();
  
  private:
      Ui::MainWindow *ui;
      QextSerialPort *port;
  
  public slots:
      void onDataAvailable();
  };
  </code></pre>