title: Upgrade from Opencv 2.3 to 2.4.2
body: <p>I´m building an Android app using Opencv, It´s an old project, so I was using cygwin with ndk 6, I upgraded to ndk8b, and use only windows. I updated ADT to lasted version. Build .so target file it´s ok with Opencv 2.3, but when I change my GNU C/GNU C++ Path and Symbols to a Opencv2.4.2 directory and change my include of OpenCV.mk on Android.mk file, build failed. </p>
  
  <p>The erros are:</p>
  
  <pre>
  /jni/scan_utils.cpp:44: undefined reference to `cvReleaseImage'
  /jni/scan_utils.cpp:50: undefined reference to `cvLoadImage'
  /jni/scan_utils.cpp:54: undefined reference to `cvCreateMat'
  /jni/scan_utils.cpp:77: undefined reference to `cvGetPerspectiveTransform'
  </pre>
  
  <p>But if I click on function my CDT plugin on eclipse show me the reference.</p>
  
  <p>Any help?</p>