brew updateしたらemacsに日本語対応パッチが取り込まれていました。これは嬉しい。
$ brew info emacs emacs: stable 24.3, HEAD http://www.gnu.org/software/emacs/ Not installed From: https://github.com/mxcl/homebrew/commits/master/Library/Formula/emacs.rb ==> Dependencies Build: pkg-config ✔ Optional: gnutls ✘ ==> Options --cocoa Build a Cocoa version of emacs --japanese Patch for Japanese input methods --keep-ctags Don't remove the ctags executable that emacs provides --srgb Enable sRGB colors in the Cocoa version of emacs --use-git-head Use Savannah (faster) git mirror for HEAD builds --with-gnutls Build with gnutls support --with-x Include X11 support