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hybridgroup / gocv

Go package for computer vision using OpenCV 4 and beyond. Includes support for DNN, CUDA, OpenCV Contrib, and OpenVINO.
https://gocv.io
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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 pkg-config: exit status 1 #363

Open GothicFox opened 5 years ago

GothicFox commented 5 years ago

i'm on macos sierra 10.12.6, and after i following the tuturials and run cmd: go run ./cmd/version/main.go, i got the following error message:

pkg-config --cflags -- opencv

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 pkg-config: exit status 1

so please help , thx!

Your Environment

export CGO_CXXFLAGS="--std=c++11" export CGO_CPPFLAGS="-I/usr/local/Cellar/opencv/3.4.3/include" export CGO_LDFLAGS="-L/usr/local/Cellar/opencv/3.4.3/lib -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dnn_objdetect -lopencv_dpm -lopencv_face -lopencv_photo -lopencv_fuzzy -lopencv_hfs -lopencv_img_hash -lopencv_line_descriptor -lopencv_optflow -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_dnn -lopencv_plot -lopencv_xfeatures2d -lopencv_shape -lopencv_video -lopencv_ml -lopencv_ximgproc -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_flann -lopencv_xobjdetect -lopencv_imgcodecs -lopencv_objdetect -lopencv_xphoto -lopencv_imgproc -lopencv_core"

deadprogram commented 5 years ago

Hello @BottleChain the newest release of GoCV requires OpenCV 4.0+

Check out the latest info here: https://github.com/hybridgroup/gocv#installation-2

Hope that helps!

bprfh commented 5 years ago

I had the same Problem on Fedora 29. At first I tried to install via make install. But I got the same error as above, so I followed the complete installation list. I wanted to install it globally, so my finall make command was make sudo_install To me it seems like there are two issues:

  1. The PKG_CONFIG_PATH does not get set.
  2. Either there is a issue with the paths, or the LD_LIBRARY_PATH is not set

To fix the first issue, set the PKG_CONFIG_PATH to: /usr/local/lib64/pkgconfig export PKG_CONFIG_PATH="/usr/local/lib64/pkgconfig" To fix the second issue, set the LD_LIBRARY_PATH to: /usr/local/lib64/ export LD_LIBRARY_PATH ="/usr/local/lib64/"

If you want these variables to be set even if you close your current terminal, but these either in ~/.bashrc or ~/.bash_profile depending on your distribution.

To verify that the variables are set:

  1. echo $PKG_CONFIG_PATH
  2. echo $LD_LIBRARY_PATH

Is this the expected way to do this, or is there a deeper problem and I'm just using a workaround?

If my solution is correct could these steps be put in the makefile, or should I make a pr for the installation readme?

edit: at least to me it seems that the libraries are not moved to the right folder. ldconfig looks in /usr/lib64, /lib64 /lib and /usr/lib the make file moves the files to /usr/local/lib64 which is a really good idea because it follows the FHS standard, but per default ldconfig doesn't look in that directory for libs. If you add the path to /etc/ld.so.conf then it works. So the solution seems to either add the environment variable $LD_LIBRARY_PATH, or edit the /etc/ld.so.conf file. Add this to the makefile or write it as a workaround?

AbdulmalikAlyousfi commented 3 years ago

I faced the same issue; the way I fixed it was by creating 'opencv.pc' file to /usr/local/lib/pkgconfig

when I run, pkg-config --cflags --libs opencv, I get the following:

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

The error message saying that opencv.pc is missing, so the solution is to add this file and import it into the environment variable. The steps as follows:

sudo vi /usr/local/lib/pkgconfig/opencv.pc

inside the new file paste the following:

prefix=/usr/local exec_prefix=${prefix} includedir=${prefix}/include libdir=${exec_prefix}/lib64

Name: opencv Description: The opencv library Version:4.2.0 Cflags: -I${includedir}/opencv4 Libs: -L${libdir} -lopencv_stitching -lopencv_objdetect -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann -lopencv_core

Save the file and exit, and then import the file into the environment variable:

export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

The output result when executing pkg-config --cflags --libs opencv again is as follows:

-I/usr/local/include/opencv4 -L/usr/local/lib64 -lopencv_stitching -lopencv_objdetect -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann -lopencv_core

I hope this will help you!

adammaj1 commented 1 year ago

There is a file :

/usr/local/lib/pkgconfig/opencv4.pc

pkg-config --cflags -- opencv4

-I/usr/local/include/opencv4