Hi, Sierra

I recently upgraded my Mac to High Sierra and got this gross message when I tried to use Git:

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

My machine was expecting Git to be implemented as an Xcode command line tool. To fix the problem, I simply installed Xcode.

xcode-select --install

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