Error Message "Xcode alone is not sufficient on Sierra"

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.

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! 🎉

update for 2019

macOS Mojave 10.14.5

Use Xcode10.2 for macOS 10.14

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.

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.