Homebrew
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Homebrew is a package manager that allows you to install software. To install Homebrew, follow these Terminal command line instructions:
install homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
check homebrew
brew doctor
install graphviz (optional)
brew install graphviz
install opencv
brew tap homebrew/science
xcode-select --install
brew edit opencv
change: -DBUILD_opencv_java=OFF to -DBUILD_opencv_java=ON
brew install --build-from-source opencv
