Can't compile first opencv program, '/usr/bin/ld: cannot find -lcv'
gcc, graphics, image, opencv
Solution
As seen from the changelog published on the OpenCV site (for version 2.2), the library names have changed from version 2.2 onwards, so the library names used to link for version 2.1 cannot be used to compile with version 2.4 (i.e. `libcv.so` which is linked through `-lcv` is not valid library name for version > 2.1 as so on ). You need to pass the libraries which are part of the new version of OpenCV (which have been listed through `pkg-config` command). You can make use of `pkg-config` to pass the compiler & linker flags something on these lines : `g++ cv.cpp -o cv $(pkg-config --cflags --libs opencv)`. Hope this helps!
Problem
``` g++ cv.cpp -o cv -I /usr/local/include/opencv -L /usr/local/lib -lm -lcv -lhighgui -lcvaux ``` Error: ``` /usr/bin/ld: cannot find -lcv collect2: ld returned 1 exit status ``` Code: ``` #include <cv.h> #include <ml.h> #include <cxcore.h> //#include <cxtypes.h> #include <highgui.h> int main(int argc, char* argv[]) { IplImage* img = cvLoadImage( "bal.png" ); cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE ); cvShowImage("Example1", img); cvWaitKey(0); cvReleaseImage( &img ); cvDestroyWindow( "Example1" ); return 0; } ``` It's 32 bit, ``` locate libcv /usr/lib/libcv.so.2.1 /usr/lib/libcv.so.2.1.0 ``` ``` `pkg-config --cflags --libs opencv` -I/usr/local/include/opencv -I/usr/local/include /usr/local/lib/libopencv_calib3d.so /usr/local/lib/libopencv_contrib.so /usr/local/lib/libopencv_core.so /usr/local/lib/libopencv_features2d.so /usr/local/lib/libopencv_flann.so /usr/local/lib/libopencv_gpu.so /usr/local/lib/libopencv_highgui.so /usr/local/lib/libopencv_imgproc.so /usr/local/lib/libopencv_legacy.so /usr/local/lib/libopencv_ml.so /usr/local/lib/libopencv_nonfree.so /usr/local/lib/libopencv_objdetect.so /usr/local/lib/libopencv_photo.so /usr/local/lib/libopencv_stitching.so /usr/local/lib/libopencv_ts.so /usr/local/lib/libopencv_video.so /usr/local/lib/libopencv_videostab.so ``` Installed OpenCV-2.4.0 in /usr/local, I also have a system python-opencv. Where am i doing the mistake? What should i do?