Step 1: Install the Package
Double click the package in this disk image to install. This installs git to /usr/local/git, and places symlinks into /usr/local/bin and /usr/share/man/.
Step 2: Remove stubs (Yosemite and earlier)
When you run `git`, you might see this message: ‘The “git” command requires the command line developer tools. Would you like to install the tools now?”
This is because OS X ships with stubs, and these stubs are taking precedence over /usr/local/bin.
To resolve, run the following command:
sudo mv /usr/bin/git /usr/bin/git-system
This should not be a problem in OS X 10.11 (El Capitan), as /usr/local/bin takes precedence over /usr/bin