[macOS Mojave 10.14.3] Set up environment for Opencv4.0.1 C++ development

1. Install Xcode v10.2

2. Install Command Line Tools

xcode-select --install

3. Install homebrew

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

4. Install OpenCV

brew install opencv

OpenCV located at “/usr/local/Cellar/opencv/”

• To remove

brew rm opencv

• To update all installed packages

brew update && brew upgrade && brew cleanup

5. Install pkg-config

brew install pkg-config

pkg-config located at /usr/local/lib/pkgconfig/ where containing symlink to package, checking opencv4.pc exist or not.

If opencv4.pc does not exist, make a symlink:

• Put to ./bash_profile

export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/

• Make a symlink

ln -s /usr/local/Cellar/opencv/4.0.1/lib/pkgconfig/opencv4.pc $PKG_CONFIG_PATH

6. Check OpenCV linker flags

pkg-config --cflags --libs opencv4

Look like this:

-I/usr/local/Cellar/opencv/4.0.1/include/opencv4/opencv -I/usr/local/Cellar/opencv/4.0.1/include/opencv4 -L/usr/local/Cellar/opencv/4.0.1/lib -lopencv_gapi -lopencv_stitching -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dnn_objdetect -lopencv_dpm -lopencv_face -lopencv_fuzzy -lopencv_hfs -lopencv_img_hash -lopencv_line_descriptor -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_superres -lopencv_optflow -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_dnn -lopencv_plot -lopencv_videostab -lopencv_video -lopencv_xfeatures2d -lopencv_shape -lopencv_ml -lopencv_ximgproc -lopencv_xobjdetect -lopencv_objdetect -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_flann -lopencv_xphoto -lopencv_photo -lopencv_imgproc -lopencv_core

• If you get an error, then change opencv4 to opencv

pkg-config --cflags --libs opencv