MAC uses brew to install low-version software, such as OpenCV

Because the libraries that are installed with homebrew in Mac are up-to-date, sometimes it is difficult to use older versions of the software.

Want to use opencv3.3 in the work, but the use of brew installation is 3.4, and later found a method, that is to specify the installation of the Opencv.rb file

Use Brew info OpenCV to see: (the latest is 3.4, I installed 3.3)

Opencv:stable 3.4.0 (bottled)

Open Source Computer Vision Library

https://opencv.org/

/usr/local/cellar/opencv/3.3.0_3 (516 files, 123MB) *

Poured from bottle in 2018-02-24 at 15:28:54

From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/opencv.rb

Above can see OpenCV is from formula/opencv.rb this file, as long as find this file to the corresponding opencv3.3 commit point should be OK

Here first the clone code

git clone [email protected]:Homebrew/homebrew-core.git

Enter the Homebrew-core directory with git log./formula/opencv.rb | Less

Commit 2e4c2bb04c08074723274e618343301038777663

Author:brewtestbot <[email protected]>

Date: Sat Sep +0000 11:10:27

Opencv:update 3.3.0_3 bottle.

Can be found at this commit point opencv3.3, so git checkout to this point,

Then use the Brew install./FORMULA/OPENCV.RB, install the OPENCV, then the installation is opencv3.3.

MAC uses brew to install low-version software, such as OpenCV