Hi folks! I'm trying to build opencv http://lumiguide.github.io/haskell-opencv/doc/index.html as dependency on my macOS Sierra. I stuck with missing _contrib and _legacy C libraries. I've installed OpenCV with contrib packages via brew. Here are the steps I've done. Installation I have installed opencv via brew (with some patches http://www.pyimagesearch.com/2017/05/15/resolving-macos-opencv-homebrew-inst... of brew formula): brew install opencv3 --with-contrib --with-python3 python Python 3.6.1 (default, Apr 4 2017, 09:40:21) [GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.38)] on darwin Type "help", "copyright", "credits" or "license" for more information.>>> import cv2>>> cv2.__version__'3.2.0' I have not installed Python 2.7 bindings. Python 3.6 only. Now stack build need some attention too: stack build opencv-0.0.1.0: configure Progress: 1/2 -- While building package opencv-0.0.1.0 using: Configuring opencv-0.0.1.0... setup: Missing dependencies on foreign libraries: * Missing C libraries: opencv_calib3d, opencv_imgproc, opencv_contrib, opencv_legacy, This problem can usually be solved by installing the system packages that provide these libraries (you may need the "-dev" versions). If the libraries are already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are. Following suggestion I've tried specify include and lib dirs: stack build --extra-lib-dirs=/usr/local/opt/opencv3/lib --extra-include-dirs=/usr/local/opt/opencv3/include opencv-0.0.1.0: configure Progress: 1/2 -- While building package opencv-0.0.1.0 using: Configuring opencv-0.0.1.0... setup: Missing dependencies on foreign libraries: * Missing C libraries: opencv_contrib, opencv_legacy, This problem can usually be solved by installing the system packages that provide these libraries (you may need the "-dev" versions). If the libraries are already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are. I have no idea how to find where missing libraries are located. Would appreciate any help! Arthur!