Eu tive esse problema e consegui instalar uma versão funcional usando o Homebrew.
# first uninstall the broken version
# mount the DMG for the broken version using Finder
# "type" this with the tab key! it saves typing and fixes the version number
cd /Volumes/Git\ 2.0.1\ Snow\ Leopard\ Intel\ Universal/
./uninstall.sh
# make bash forget about the uninstalled binary
hash -r
cd
# now install the working version
# assumes you have Homebrew installed
brew install git
git version