Package opencv was not found in the pkg-config search path

Question

I have installed OpenCV using the instructions in https   help ubuntu com community OpenCV    sudo su   sudo apt-get install build-essential   sudo apt-get install libavformat-dev   sudo apt-get install ffmpeg   sudo apt-get install libcv2 3 libcvaux2 3 libhighgui2 3 python-opencv opencv-doc libcv-dev libcvaux-dev libhighgui-dev   now when i execute  pkg-config --cflags --libs opencv  i get this error   Package opencv was not found in the pkg-config search path  Perhaps you should add the directory containing  opencv pc  to the PKG CONFIG PATH environment variable No package  opencv  found   how can I resolve this problem   -------UPDATE-------  OK  I figured out how to solve the problem     I made a file named  opencv pc  and copied it to   usr local lib pkgconfig  Then i added these two lines to   bashrc    PKG CONFIG PATH  PKG CONFIG PATH  usr local lib pkgconfig export PKG CONFIG PATH   that s it  everything is OK now   the contents of the file are   prefix  usr exec prefix   prefix  includedir   prefix  include libdir   exec prefix  lib  Name  opencv Description  The opencv library Version  2 x x Cflags  -I  includedir  opencv -I  includedir  opencv2 Libs  -L  libdir  -lopencv calib3d -lopencv imgproc -lopencv contrib -lopencv legacy -lopencv core -lopencv ml -lopencv features2d -lopencv objdetect -lopencv flann -lopencv video -lopencv highgui   UPDATE - 2014  it seems that the ubuntu community has completed the documentation on installing openCV  all you have to do now is to download the installation script from https   github com jayrambhia Install-OpenCV blob master Ubuntu opencv latest sh and execute it

User · Answer

I installed opencv following the steps on https://docs.opencv.org/trunk/d7/d9f/tutorial_linux_install.html

Except on Step 2, use: cmake -D CMAKE_BUILD_TYPE=Release -D OPENCV_GENERATE_PKGCONFIG=YES -D CMAKE_INSTALL_PREFIX=/path/to/opencv/ ..

Then locate the opencv4.pc file, mine was in opencv/build/unix-install/

Now run: $ export PKG_CONFIG_PATH=/path/to/the/file

User · Answer

I got the same error when trying to compile a Go package on Debian 9 8     pkg-config --cflags  -- libssl libcrypto Package libssl was not found in the pkg-config search path  Perhaps you should add the directory containing  libssl pc    The thing is that pkg-config searches for package meta-information in  pc files  Such files come from the dev package  So  even though I had libssl installed  I still got the error  It was resolved by running   sudo apt-get install libssl-dev

User · Answer

it seems that the ubuntu community has completed the documentation on installing openCV    so all you have to do now is to download the installation script from here and execute it   don t forget to make it executable   chmod  x opencv latest sh   then    opencv latest sh

User · Answer

configure --enable-libopencv ERROR  opencv not found using pkg-config     cat  usr lib64 pkgconfig opencv pc   Package Information for pkg-config  prefix  usr exec prefix   prefix  libdir   exec prefix  lib64 includedir old   prefix  include opencv includedir new   prefix  include  Name  OpenCV Description  Open Source Computer Vision Library Version  3 1 0 Libs  -L  exec prefix  lib64 -lopencv shape -lopencv stitching -lopencv superres -lopencv videostab -lopencv aruco -lopencv bgsegm -lopencv bioinspired -lopencv ccalib -lopencv cvv -lopencv dnn -lopencv dpm -lopencv fuzzy -lopencv hdf -lopencv line descriptor -lopencv optflow -lopencv plot -lopencv reg -lopencv saliency -lopencv stereo -lopencv structured light -lopencv rgbd -lopencv surface matching -lopencv tracking -lopencv datasets -lopencv text -lopencv face -lopencv video -lopencv ximgproc -lopencv calib3d -lopencv features2d -lopencv flann -lopencv xobjdetect -lopencv objdetect -lopencv ml -lopencv xphoto -lopencv highgui -lopencv videoio -lopencv imgcodecs -lopencv photo -lopencv imgproc -lopencv core Libs private  -L usr lib64 -lQt5Test -lQt5Concurrent -lQt5OpenGL -L lib64 -lwebp -lpng -ltiff -ljasper -ljpeg -lImath -lIlmImf -lIex -lHalf -lIlmThread -lgdal -lgstvideo-1 0 -lgstapp-1 0 -lgstbase-1 0 -lgstriff-1 0 -lgstpbutils-1 0 -lgstreamer-1 0 -lucil -lunicap -lpangoft2-1 0 -lpango-1 0 -lgobject-2 0 -lfontconfig -lfreetype -lglib-2 0 -ldc1394 -lv4l1 -lv4l2 -lgphoto2 -lgphoto2 port -lexif -lQt5Core -lQt5Gui -lQt5Widgets -lhdf5 hl -lhdf5 -lz -ldl -lm -ltesseract -llept -lpthread -lrt -lGLU -lGL Cflags  -I  includedir old  -I  includedir new      pkg-config --cflags --libs opencv -I usr include opencv -lopencv shape -lopencv stitching -lopencv superres -lopencv videostab -lopencv aruco -lopencv bgsegm -lopencv bioinspired -lopencv ccalib -lopencv cvv -lopencv dnn -lopencv dpm -lopencv fuzzy -lopencv hdf -lopencv line descriptor -lopencv optflow -lopencv plot -lopencv reg -lopencv saliency -lopencv stereo -lopencv structured light -lopencv rgbd -lopencv surface matching -lopencv tracking -lopencv datasets -lopencv text -lopencv face -lopencv video -lopencv ximgproc -lopencv calib3d -lopencv features2d -lopencv flann -lopencv xobjdetect -lopencv objdetect -lopencv ml -lopencv xphoto -lopencv highgui -lopencv videoio -lopencv imgcodecs -lopencv photo -lopencv imgproc -lopencv core     uname -a Linux fedora-23-x64 4 8 13-100 fc23 x86 64  1 SMP Fri Dec 9 14 51 40 UTC 2016 x86 64 x86 64 x86 64 GNU Linux

User · Answer

From your question I guess you are using Ubuntu  or a derivate   If you use   apt-file search opencv pc  then you see that you have to install libopencv-dev    After you do so  pkg-config --cflags opencv and pkg-config --libs opencv should work as expected

User · Answer

with opencv 4 0    add -DOPENCV GENERATE PKGCONFIG ON to build arguments pkg-config --cflags --libs opencv4  instead of opencv

User · Answer

Hi first of all i would like you to use  Synaptic Package Manager   You just need to goto the ubuntu software center and search for synaptic package manager   The beauty of this is that all the packages you need are easily available here  Second it will automatically configures all your paths  Now install this then search for opencv packages over there if you found the package with the green box then its installed but else the package is not in the right place so you need to reinstall it but from package manager this time  If installed then you can do this only  you just need to fill the OpenCV DIR variable with the path of opencv  containing the OpenCVConfig cmake file       export OpenCV DIR  lt path of opencv gt

User · Answer

When you run cmake add the additional parameter -D OPENCV GENERATE PKGCONFIG YES  this will generate opencv pc file  Then make and sudo make install as before  Use the name opencv4 instead of just opencv Eg - pkg-config --modversion opencv4

User · Answer

apt-file search opencv pc   ls  usr local lib pkgconfig    sudo cp  usr local lib pkgconfig opencv4 pc   usr lib x86 64-linux-gnu pkgconfig opencv pc   pkg-config --modversion opencv

[opencv] Package opencv was not found in the pkg-config search path

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