brew install git

Warning: You are using OS X 10.6.
We (and Apple) do not provide support for this old version.
You may encounter build failures or other breakages.
==> Downloading https://www.kernel.org/pub/software/scm/git/git-2.8.1.tar.xz
Already downloaded: /Library/Caches/Homebrew/git-2.8.1.tar.xz
==> make install prefix=/usr/local/Cellar/git/2.8.1 sysconfdir=/usr/local/etc CC
Last 15 lines from /Users/mikeeng/Library/Logs/Homebrew/git/01.make:
	sed -e '1{' \
	    -e '	s|#!.*perl|#!/usr/bin/perl|' \
	    -e '	h' \
	    -e '	s=.*=use lib (split(/:/, $ENV{GITPERLLIB} || "'"$INSTLIBDIR"'"));=' \
	    -e '	H' \
	    -e '	x' \
	    -e '}' \
	    -e 's/@@GIT_VERSION@@/2.8.1/g' \
	    git-add--interactive.perl >git-add--interactive+ && \
	chmod +x git-add--interactive+ && \
	mv git-add--interactive+ git-add--interactive
make[2]: *** No rule to make target `/System/Library/Perl/5.10.0/darwin-thread-multi-2level/CORE/config.h', needed by `perl.mak'.  Stop.
make[1]: *** [instlibdir] Error 2
make: *** [git-add--interactive] Error 2
make: *** Waiting for unfinished jobs....

READ THIS: https://git.io/brew-troubleshooting
If reporting this issue please do so at (not Homebrew/brew):
  https://github.com/Homebrew/homebrew-core/issues

These open issues may also help:
git-annex 6.20160619 https://github.com/Homebrew/homebrew-core/pull/3228
hg-git 0.8.5 (new formula) https://github.com/Homebrew/homebrew-core/pull/2577
git: cannot run gitk https://github.com/Homebrew/homebrew-core/issues/115
git-webui 1.2.0 (new formula) https://github.com/Homebrew/homebrew-core/pull/1648
cannot install on Mac OSX 10.8.5 ==> Downloading and installing Homebrew... You must: brew install git You must: brew install git Error: Git is unavailable https://github.com/Homebrew/homebrew-core/issues/2385
git-gitlab 0.1.0 (new formula) https://github.com/Homebrew/homebrew-core/pull/1064
git-stree: added deprecation warning and fixed line order https://github.com/Homebrew/homebrew-core/pull/1842
Warning: You are using OS X 10.6.
We (and Apple) do not provide support for this old version.
You may encounter build failures or other breakages.