Error Message “Xcode alone is not sufficient on Sierra”

Question

I\'d like to install openCV to vectorize image, but there\'s a series error message regarding Xcode and Ruby.

First, I use terminal to install openCV, brew install

Answer 1

I had the same issue in my Macbook Pro on Sierra. Apart from updating Xcode from the App Store, I also installed the command line utilities using the xcode-select --install command.

After the update steps, brew commands started working fine. I also updating my OS during this time.