I’ve upgraded my MacbBook Pro to Mountain Lion and, shockingly, there was absolutely no real issue to speak of. Well, except for git gui. Even reinstalling git-osx-installer didn’t help. Looking around my file system, I did see that git-gui is still around (/usr/local/git/libexec/git-core/git-gui). Comparing a Lion machine’s config with a Mountain Lion doesn’t really scream out any real reason why git gui shouldn’t work (probably because of my lack of understanding of how git’s file system is set up) but at least you can issue the command directly and get into git gui.

update

This is my workaround. Nicer than before even:

Edit ~/.bash_profile and put in {% codeblock Workaround - lang:bash .bash_profile %} alias gui=’/usr/local/git/libexec/git-core/git-gui' {% endcodeblock %} Save it and close the terminal. Now all you have to type is ‘gui’ to get git-gui to pop up.