icu4cとharfbuzzの依存関係で　cairoが引っかかってgtk+がupdateできなかった
ーーーー以下　log

brew rm icu4c
Uninstalling /usr/local/Cellar/icu4c/50.1...
$ brew install icu4c
==> Downloading [URL]
Already downloaded: /Library/Caches/Homebrew/icu4c-50.1.mountainlion.bottle.1.tar.gz
==> Pouring icu4c-50.1.mountainlion.bottle.1.tar.gz
==> Caveats
This formula is keg-only: so it was not symlinked into /usr/local.

Conflicts; see: [URL]

Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:

LDFLAGS: -L/usr/local/opt/icu4c/lib
CPPFLAGS: -I/usr/local/opt/icu4c/include

==> Summary
〓 /usr/local/Cellar/icu4c/50.1: 235 files, 55M
$ brew info harfbuzz
harfbuzz: stable 0.9.12
[URL]
Depends on: pkg-config, autoconf, automake, libtool, glib, icu4c, fontconfig
/usr/local/Cellar/harfbuzz/0.9.12 (29 files, 1.8M) *
[URL]
==> Options
--without-icu4c
Build without icu4c support
$ brew install harfbuzz
Error: harfbuzz-0.9.12 already installed
suzuki-juunotto-no-MacBook-Pro:lib butcher$ brew uninstall harfbuzz
Uninstalling /usr/local/Cellar/harfbuzz/0.9.12...
$ brew install harfbuzz
==> Downloading [URL]
Already downloaded: /Library/Caches/Homebrew/harfbuzz-0.9.12.tar.bz2
==> ./autogen.sh
==> ./configure --prefix=/usr/local/Cellar/harfbuzz/0.9.12
==> make install
〓 /usr/local/Cellar/harfbuzz/0.9.12: 29 files, 1.8M, built in 40 seconds
brew install gtk+
==> Installing gtk+ dependency: pango
==> Downloading [URL]
Already downloaded: /Library/Caches/Homebrew/pango-1.32.6.tar.xz
==> Patching
patching file pango/pangoft2-render.c
patching file pango/pangoft2.c
==> ./configure --prefix=/usr/local/Cellar/pango/1.32.6 --enable-man --with-html
==> make
==> make install
〓 /usr/local/Cellar/pango/1.32.6: 119 files, 3.8M, built in 21 seconds
==> Installing gtk+
==> Downloading [URL]
Already downloaded: /Library/Caches/Homebrew/gtk+-2.24.15.tar.xz
==> ./configure --prefix=/usr/local/Cellar/gtk+/2.24.15 --disable-glibtest --dis
==> make install
〓 /usr/local/Cellar/gtk+/2.24.15: 1184 files, 50M, built in 106 seconds