Do you have problems with git since you got your new shiny kitty on your machine?
Well, there's a fix for that. You just need Xcode (from the Mac App Store) and an Apple ID assigned to a dev Account (which you probably have as an iOS Dev).
First, install Xcode (Mac Appstore version).
Then, launch Xcode and Navigate to the Settings panel. Do this by clicking Xcode > Preferences or Cmd + ,
Click on Downloads and then on Components. You should see Command Line Tools. Hit install to start the download. You may be prompted to enter your Apple ID if you never did that before in Xcode.
When the download is finished, open a terminal window and you're done. Git works again!