Railsをローカルに落として bundle install する時に以下のようなエラーが出た。 $ bundle install ... ... Gem::Ext::BuildError: ERROR: Failed to build gem native extension. /Users/USERNAME/.rbenv/versions/2.2.1/bin/ruby -r ./siteconf20150428-22330-11fwtg6.rb extconf.rb checking for clang... yes checking for Magick-config... no checking for pkg-config... yes checking for outdated ImageMagick version (<= 6.4.9)... *** extconf.rb f
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