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I assume the code used by you is this:

#include <stdio.h>
#include <opencv2/opencv.hpp>

using namespace cv;

int main( int argc, char** argv )
{
  Mat image;
  image = imread( argv[1], 1 );

  if( argc != 2 || !image.data )
    {
      printf( "No image data \n" );
      return -1;
    }

  namedWindow( "Display Image", CV_WINDOW_AUTOSIZE );
  imshow( "Display Image", image );

  waitKey(0);

  return 0;
}

And I compiled it successfully with this command:

g++ -ggdb `pkg-config --cflags opencv` -o `basename test.cpp .cpp` test.cpp `pkg-config --libs opencv`