This page has information on how to install and use GoCV on macOS.
Install the GoCV package:
go get -u -d gocv.io/x/gocv
Now, install OpenCV 3.4.3 using Homebrew:
brew install opencv
Note that if you already have an earlier version of OpenCV installed, you should upgrade it to the latest version, instead of installing:
brew upgrade opencv
You can avoid many problems with GoCV on macOS just by making sure that you do not have multiple versions of OpenCV installed, and are using the latest version.
pkg-config is used to determine the correct flags for compiling and linking OpenCV. You can install it by using Homebrew:
brew install pkgconfig
Once you have installed OpenCV, you should be able to build or run any of the command examples:
go run ./cmd/version/main.go
The version program should output the following:
gocv version: 0.17.0 opencv lib version: 3.4.3
If you are running a version of Go older than v1.10 and not modifying GoCV source, precompile the GoCV package to significantly decrease your build times:
go install gocv.io/x/gocv
By default, pkg-config is used to determine the correct flags for compiling and linking OpenCV. This behavior can be disabled by supplying
-tags customenv when building/running your application. When building with this tag you will need to supply the CGO environment variables yourself.
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"
Please note that you will need to run these 3 lines of code one time in your current session in order to build or run the code, in order to setup the needed ENV variables. Once you have done so, you can execute code that uses GoCV with your custom environment like this:
go run -tags customenv ./cmd/version/main.go