title: opencv framework into XCode: Header-Linkers not working
body: <p>I guess I did a terrible mistake by assuming that the opencv framework can get updated and easily linked into an existing XCode-project again. The mistake happens at Step-Nr2 of the guidance on how to get opencv &amp; make the XCode find header-files etc and finally create and install the opencv framework.</p>
  
  <p>The 3 Steps are (...having a terminal on Mac opened and writing:)</p>
  
  <p>Step1:
      cd ~/
      git clone <a href="https://github.com/Itseez/opencv.git" rel="nofollow">https://github.com/Itseez/opencv.git</a>
  ---> This one went through successfully</p>
  
  <p>Step2:
      cd /
      sudo ln -s /Applications/Xcode.app/Contents/Developer Developer
  ---> This one fails
  The error message is:  ln: Developer/Developer: File exists</p>
  
  <p>Step3:
      cd ~/
      python opencv/platforms/ios/build_framework.py ios
  ---> This one went through successfully</p>
  
  <p>Now, since Step-Nr2 did not go through, I get the compiler-error now in XCode that</p>
  
  <pre><code>#import &lt;opencv2/opencv.hpp&gt;   // --&gt; assumption: StepNr2 did not go through and therefore header-linker do not work (what is there to do ???)
  </code></pre>
  
  <p>cannot be found ! It seems to me that the symbolic link for Xcode to let OpenCV build scripts and find the compiler, header files etc. does no longer work for the newly integrated opencv-framework. It did work for an old one. But Step-Nr2 would be needed again successully !</p>
  
  <p>Can anybody tell me what to do in order to do Step2 sucessfully (in a case like mine where it was carried out previously a couple of weeks ago). What files do I  need to delete and where can I find them ? (I cannot find the "Developer File" for example (as ist sais that already existed). Where can it be found and deleted ?? Or what do I need to do ?</p>
  
  <p>Or can the settings even be made in the XCode project itself ? Where and how would I do that ?</p>
  
  <p>Thanks for any help on this!</p>