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 opencv.
Then, I got error message indicating that the system doesn't like my ruby version.
/usr/local/Homebrew/Library/Homebrew/brew.rb:12:in `<main>': Homebrew must be run under Ruby 2.3! You're running 2.0.0. (RuntimeError)
So, I want to upgrade my ruby. I followed several update strategy from this post. First ruby upgrade trial: brew link --overwrite ruby & brew unlink ruby && brew link ruby and get
Error: No such keg: /usr/local/Cellar/ruby
Then second ruby upgrade trial: brew upgrade ruby and see the following error message.
Error: Xcode alone is not sufficient on Sierra. Install the Command Line Tools: xcode-select --install
This error message means I need to install Xcode which I already install. So, I check my Xcode status with code-select -p and get /Applications/Xcode.app/Contents/Developer which means I am fine.
I saw a comment regarding where you install python could be a big issue. Quote from the source:
If you see /usr/local/bin/python3 then you are correctly using the Homebrew version of Python. If the output is instead /usr/bin/python3 then you are incorrectly using the system version of Python.
I check which python3 and get
/Users/******/anaconda3/bin/python3
Could this be the problem? How can I change system version to local?
Let me explain this myself so people won't make the same mistakes.
When I saw the last line of the error message
Error: Xcode alone is not sufficient on Sierra. Install the Command Line Tools: xcode-select --install
My thought was: I already have Xcode why the system ask me to "reinstall" it. However, thanks for @SamiKuhmonen @ Beartech @patrick kuang suggestion, I search a page (in Mandarin). xcode-select --install does not reinstall the whole Xcode. It means install some missing command line tools which is required by installing Ruby.
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.
Trying to install k8s package via brew , I just got the same issue a while ago saying in the terminal :
Error: Xcode alone is not sufficient on Sierra.
Install the Command
Line Tools: xcode-select --install
You need to download *.dmg file; named Command Line Tools (macOS x.x.x) for XCode N . Search on it here : https://developer.apple.com/download/more/ . You must have developer account.
Then, congrats! ?
I got the same message despite having Xcode and the command line tools already being installed a long time ago and updated numerous times.
I think it is the Apple way of telling you that Xcode command line tools need to be updated, as the App Store showed me the below:
After executing the xcode-select --install command, the update disappears from the App Store, which means they are exactly the same thing.
