openCV program compile error libopencv core so 2 4 cannot open shared object file No such file or directory in ubuntu 12 04

Question

I compiled and installed openCV 2 4 2 in ubuntu 12 04  Under  usr local include I can see the directories  usr local opencv and  usr local opencv2   Here is the code I wrote    include  lt cv h gt   include  lt highgui h gt   include  lt iostream gt  using namespace cv  using namespace std  int main int argc char   argv       Mat image     image   imread argv 1  1       if argc    2     image data              cout  lt  lt   No image data n          return -1           namedWindow  Display Image  CV WINDOW AUTOSIZE      imshow  Display Image  image      waitKey 0      return 0      I compiled it using this command line   g   DisplayImage cpp -o DisplayImage  pkg-config opencv --cflags --libs     There were no compile time errors  however when I try to run the resulting binary with  DisplayImage code png I get the following error message     DisplayImage  error while loading shared libraries  libopencv core so 2 4  cannot open shared object file  No such file or directory

User · Answer

To make it more clear and to put it together  I had to do Two things mentioned above   1- Create a file  etc ld so conf d opencv conf and write to it the paths of folder where your opencv libraries are stored  Answer by Cookyt   2- Include the path of your  opencv s  so files in LD LIBRARY PATH     export LD LIBRARY PATH  LD LIBRARY PATH  usr local opencv lib

User · Answer

Umair R s answer is mostly the right move to solve the problem  as this error used to be caused by the missing links between opencv libs and the programme  so there is the need to specify the ld libraty path configuration  ps  the usual library path is suppose to be   export LD LIBRARY PATH  LD LIBRARY PATH  usr local lib  I have tried this and it worked well

User · Answer

You haven t put the shared library in a location where the loader can find it   look inside the  usr local opencv and  usr local opencv2 folders and see if either of them contains any shared libraries  files beginning in lib and usually ending in  so    when you find them  create a file called  etc ld so conf d opencv conf and write to it the paths to the folders where the libraries are stored  one per line    for example  if the libraries were stored under  usr local opencv libopencv core so 2 4 then I would write this to my opencv conf file    usr local opencv    Then run   sudo ldconfig -v   If you can t find the libraries  try running  sudo updatedb  amp  amp  locate libopencv core so 2 4   in a shell   You don t need to run updatedb if you ve rebooted since compiling OpenCV   References   About shared libraries on Linux  http   www eyrie org  eagle notes rpath html  About adding the OpenCV shared libraries  http   opencv willowgarage com wiki InstallGuide Linux

User · Answer

Find the folder containing the shared library libopencv core so 2 4 using the following command line   sudo find   -name  libopencv core so 2 4     Then I got the result     usr local lib libopencv core so 2 4    Create a file called   etc ld so conf d opencv conf  and write to it the path to the folder where the binary is stored For example  I wrote  usr local lib  to my opencv conf file  Run the command line as follows   sudo ldconfig -v   Try to run the command again

User · Answer

Add this link    usr local lib   so     The total is   g   -o main out main cpp -I  usr local include -I  usr local include opencv -I  usr local include opencv2 -L  usr local lib  usr local lib   so  usr local lib   so

[c++] openCV program compile error "libopencv_core.so.2.4: cannot open shared object file: No such file or directory" in ubuntu 12.04

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