Recently, I installed opencv with the following command:
brew install opencv
I found opencv3 was installed in dir /usr/include and /usr/lib. But what I want is opencv2. How can install opencv2 with the brew command?
The easiest way to find the answer is to use brew search to look for available packages. So, in your case:
brew search opencv
There you will see the package opencv@2 listed. So, you need:
brew install opencv@2