Hi
I've installed opencv2.2 from source and tried to compile an example but i get this example :
symbol lookup error: /usr/lib/libQtOpenGL.so.4: undefined symbol:_ZN14QWidgetPrivate15checkWindowRoleEv
this is the main.cpp file :
Qt Code: 
  1. #include <QtGui/QApplication>
  2. #include "widget.h"
  3. #include <stdlib.h>
  4. #include <stdio.h>
  5. #include <math.h>
  6. #include "cv.h"
  7. #include <cvaux.h>
  8. #include <highgui.h>
  9. #include <cxcore.h>
  10.  
  11.  
  12. int main(int argc, char *argv[])
  13. {
  14.     QApplication a(argc, argv);
  15.     //Widget w;
  16.     //w.show();
  17.     IplImage* img = 0;
  18.     int height,width,step,channels;
  19.     uchar *data;
  20.     int i,j,k;
  21.  
  22.     if(argc<2){
  23.       printf("Usage: main <image-file-name>\n\7");
  24.       exit(0);
  25.     }
  26.  
  27.     // load an image
  28.     img=cvLoadImage("/home/aladin/image1.png");
  29.     if(!img){
  30.       printf("Could not load image file: %s\n","/home/aladin/image1.png");
  31.       exit(0);
  32.     }
  33.  
  34.     // get the image data
  35.     height    = img->height;
  36.     width     = img->width;
  37.     step      = img->widthStep;
  38.     channels  = img->nChannels;
  39.     data      = (uchar *)img->imageData;
  40.     printf("Processing a %dx%d image with %d channels\n",height,width,channels);
  41.  
  42.     // create a window
  43.     cvNamedWindow("mainWin", CV_WINDOW_AUTOSIZE);
  44.     cvMoveWindow("mainWin", 100, 100);
  45.  
  46.     // invert the image
  47.     for(i=0;i<height;i++) for(j=0;j<width;j++) for(k=0;k<channels;k++)
  48.       data[i*step+j*channels+k]=255-data[i*step+j*channels+k];
  49.  
  50.     // show the image
  51.     cvShowImage("mainWin", img );
  52.  
  53.     // wait for a key
  54.     cvWaitKey(0);
  55.  
  56.     // release the image
  57.     cvReleaseImage(&img );
  58.  
  59.     return a.exec();
  60. }
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and this is the .pro file :
Qt Code: 
  1. #-------------------------------------------------
  2. #
  3. # Project created by QtCreator 2011-05-10T14:34:50
  4. #
  5. #-------------------------------------------------
  6.  
  7. QT       += core gui
  8.  
  9. TARGET = opencv2
  10. TEMPLATE = app
  11. target.path=/usr/local/bin
  12. INSTALLS=target
  13. INCLUDEPATH +=/usr/local/include/opencv/
  14. LIBS +=-lopencv_core -lopencv_imgproc -lopencv_calib3d -lopencv_video -lopencv_features2d -lopencv_ml -lopencv_highgui -lopencv_objdetect -lopencv_contrib -lopencv_legacy
  15.  
  16. SOURCES += main.cpp\
  17.         widget.cpp
  18.  
  19. HEADERS  += widget.h
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please can someone help me to fix this ?

Thanks in advance.