That git repo claims to be retired.
I get my emacs from here http://emacsformacosx.com
I get my emacs from here http://emacsformacosx.com
The repo you're referring to is Railwaycat's mirror of Yamamoto Mitsuharu's codebase. (which previously was only available via ftp and tarballs.)
Yamamoto has recently migrated to git and hosts a repo at Chiba U, the address is: http://www.math.s.chiba-u.ac.jp/~mituharu/emacs-mac.git
HOWEVER. Railwaycat does still maintain the Homebrew tap and formula for installing Emacs Mac Port
Here: https://github.com/railwaycat/homebrew-emacsmacport
A simple install via:
brew tap railwaycat/emacsmacport
brew update
brew install emacs-mac
And you have a far superior Emacs for OSX than that built by emacsformacosx.com.Once built, you can (without any problems) move the Emacs.app into your /Applications/ folder.
Don't do yourself a disservice, install Emacs Mac Port now.