Install the latest stable version of Xcode (using web download or the Mac App Store).
Configure the Xcode command-line tools to use the newly-installed version of Xcode by running the following from the command line:
$ sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
$ sudo xcodebuild -runFirstLaunch
This is the correct path for most cases, when you want to use the latest version of Xcode. If you need to use a different version, specify that path instead.
Make sure the Xcode license agreement is signed by either opening Xcode once and confirming or running sudo xcodebuild -license from the command line.
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