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SierraにRMagickを入れる

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RMagickを入れるのに何度やっても毎回困っているのでメモ。

古いバージョンのimagemagickのインストール

普通にbrew install imagemagickでインストールされるversionには対応していないため、古いversionのimagemagickをインストールする必要がある。

以下のリンクのように、homebrewのリポジトリから古いものをcheckoutすれば良さそう
http://qiita.com/satosystems/items/8587527b185a91abfb37

だが、手元で見ると何故か古いログを取得できず断念(これなんでか分かる人教えて欲しい)

なので、githubから直接ファイルを持ってくる
https://github.com/Homebrew/homebrew-core/blob/f6b47796d0fc3a05cc00d62fc68556b77ad5a1dc/Library/Formula/imagemagick.rb

これを/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/imagemagick.rb に上書きする

$ curl https://raw.githubusercontent.com/Homebrew/homebrew-core/f6b47796d0fc3a05cc00d62fc68556b77ad5a1dc/Library/Formula/imagemagick.rb >! /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/imagemagick.rb
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  4096  100  4096    0     0  25149      0 --:--:-- --:--:-- --:--:-- 25283

すると欲しいversionのimagemagickがインストールできる

$ brew install imagemagick
==> Installing dependencies for imagemagick: pkg-config
==> Installing imagemagick dependency: pkg-config
==> Downloading https://homebrew.bintray.com/bottles/pkg-config-0.29.1_2.sierra.bottle.tar.gz
######################################################################## 100.0%
==> Pouring pkg-config-0.29.1_2.sierra.bottle.tar.gz
🍺  /usr/local/Cellar/pkg-config/0.29.1_2: 10 files, 627.5K
==> Installing imagemagick
==> Using the sandbox
==> Downloading http://www.imagemagick.org/download/releases/ImageMagick-6.9.0-10.tar.xz
######################################################################## 100.0%
==> ./configure --disable-osx-universal-binary --prefix=/usr/local/Cellar/imagemagick/6.9.0-10 --enable-shared --disable-static --with-modules --disable-openmp --without-gslib --without-perl --with-gs-font-dir=/usr/local/share/ghostscript/fonts --without-pango --without-o
==> make install
🍺  /usr/local/Cellar/imagemagick/6.9.0-10: 1,450 files, 17.6M, built in 2 minutes 18 seconds

これで必要なimagemagickはインストールできたので、RMagickもインストールできる

$ gem install rmagick
Building native extensions.  This could take a while...
Successfully installed rmagick-2.16.0
Parsing documentation for rmagick-2.16.0
Installing ri documentation for rmagick-2.16.0
Done installing documentation for rmagick after 5 seconds
1 gem installed
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