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I've installed Homebrew and fixed all of the errors that brew doctor reports, except this one:
martinjames$ brew doctor
Warning: An outdated version of Git was detected in your PATH.
Git 1.7.10 or newer is required to perform checkouts over HTTPS from GitHub.
Please upgrade: brew upgrade git
I take homebrew's advice:
martinjames$ brew upgrade git
Error: git not installed
So, I check for git:
martinjames$ which git
/usr/bin/git
And I check for the version:
martinjames$ git --version
git version 1.7.5.4
What's next?