After updating to XCode 4.5 and installing the developer tools I can no longer run the 'git gui' command from the command line. It says:
$ git gui
git: 'gui' is not a git command. See 'git --help'.
$ git --version
git version 126.96.36.199 (Apple Git-33)
Apple did indeed remove the 'git gui' command, probably because they were removing X11 which 'git gui' is based on.
I decided to just homebrew git instead of relying on the XCode command line tools.
brew install git
Then I edited the /etc/paths file to have the /usr/local/bin directory come before the /usr/bin directory, because that wasn't right either. Then exited the terminal window and restarted, and now I get:
$ which git /usr/local/bin/git $ git --version git version 188.8.131.52
and the git gui command works again.