Error Message "Xcode Alone Is Not Sufficient on Sierra"

Error Message Xcode alone is not sufficient on Sierra

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.

Homebrew saying Xcode is outdated

So as @NicolasMiari mentioned in a comment above, the fix to my issue ended up having to have both Xcode 7 and Xcode 8 on my machine. I went on the apple developer site, downloaded Xcode 8, saved it to my documents and then used:

sudo xcode-select -switch ~/Documents/Xcode.app/

and then ran my brew install which worked as expected. Afterwards I ran:

sudo xcode-select -switch /Applications/Xcode.app/

to switch back to Xcode 7.3.1.

Hope this helps someone else, and thanks for the suggestions.

Failed to install command line tools on OSX Mavericks

Install them from here. You must be a registered developer.

Other solution is: in xcode click Xcode>Open Developer Tool>More Developer Tools

This should then take you to a link which will require a developer Apple ID sign in. From there, you'll be redirected after authenticating to https://developer.apple.com/download/more/ where you can manually download and install the Command Line Tools.

xcode-select active developer directory error

This problem happens when xcode-select developer directory was pointing to /Library/Developer/CommandLineTools when a full regular Xcode was required (happens when CommandLineTools are installed after Xcode)

Solution:

1. Install Xcode (get it from https://appstore.com/mac/apple/xcode) if you don't have it yet.
2. Accept the Terms and Conditions.
3. Ensure Xcode app is in the /Applications directory (NOT /Users/{user}/Applications).
4. Point xcode-select to the Xcode app Developer directory using the following command:
   
   sudo xcode-select -s /Applications/Xcode.app/Contents/Developer

Note: Make sure your Xcode app path is correct.

• Xcode: /Applications/Xcode.app/Contents/Developer
• Xcode-beta: /Applications/Xcode-beta.app/Contents/Developer

Command Line Tools not working - OS X El Capitan, Sierra, High Sierra, Mojave

Found the fix for the problem here.

xcode-select --install

This will bring up a prompt to install the necessary command line tools.

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