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$ brew install --cocoa emacs
==> Downloading http://ftpmirror.gnu.org/emacs/emacs-23.3a.tar.bz2
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==> Downloading patches
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==> Patching
patching file src/ChangeLog
patching file src/unexmacosx.c
patching file src/s/darwin.h
patching file src/nsterm.m
patching file src/nsterm.m
patch unexpectedly ends in middle of line
Hunk #1 succeeded at 4489 with fuzz 1.
patching file lisp/term/ns-win.el
Hunk #1 succeeded at 1267 (offset 4 lines).
patching file src/nsfns.m
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patching file src/nsterm.h
patching file src/nsterm.m
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==> ./configure --prefix=/usr/local/Cellar/emacs/23.3a --without-dbus --enable-locallisppath=/usr/local/share/emacs/site-lisp --infodir=/usr/local/Cellar/emacs/23.3a/share/info/emacs --with-ns --disab
==> make bootstrap
==> make install
==> Caveats
For build options see:
  brew options emacs

Emacs.app was installed to:
  /usr/local/Cellar/emacs/23.3a

Command-line emacs can be used by setting up an alias:
  alias emacs="/usr/local/Cellar/emacs/23.3a/Emacs.app/Contents/MacOS/Emacs -nw"

 To link the application to a normal Mac OS X location:
   brew linkapps
 or:
   ln -s /usr/local/Cellar/emacs/23.3a/Emacs.app /Applications

Because the official bazaar repository might be slow, we include an option for
pulling HEAD from an unofficial Git mirror:

  brew install emacs --HEAD --use-git-head

There is inevitably some lag between checkins made to the official Emacs bazaar
repository and their appearance on the repo.or.cz mirror. See
http://repo.or.cz/w/emacs.git for the mirror's status. The Emacs devs do not
provide support for the git mirror, and they might reject bug reports filed
with git version information. Use it at your own risk.
==> Summary
/usr/local/Cellar/emacs/23.3a: 3673 files, 108M, built in 3.0 minutes