title: OpenCV ios project crash
body: <p>i have build <code>OpenCV</code> framework for <code>IOS</code> and i am learning <code>OpenCV</code> from scratch,
  the framework compiled well and when i am running this code :</p>
  
  <pre><code>IplImage *img = cvLoadImage("dpad_off.png");
  cvNamedWindow("Example1",CV_WINDOW_NORMAL);
  cvShowImage("Example1", img);
  cvWaitKey(0);
  cvReleaseImage(&amp;img);
  cvDestroyWindow("Example1");
  </code></pre>
  
  <p>the app crash with this log :</p>
  
  <pre><code>OpenCV Error: Unspecified error (The function is not implemented.
  Rebuild the library with Windows, GTK+ 2.x or Carbon support.
  If you are on Ubuntu or Debian, install libgtk2.0-dev andpkg-config,
  then re-run cmake or configure script) in cvNamedWindow, file            /Volumes/minijHome/Documents/xcode_mini/hillegass/advancedIOS/postCourse/openCV/clean-     downloads/openCVgitClone/opencv/modules/highgui/src/window.cpp, line 652
  libc++abi.dylib: terminate called throwing an exception
  </code></pre>
  
  <p>i have tried to look for answer on the web but cant figure out why this is happen.
  any idea ?</p>