Three days ago the Homebrew imagemagick formula was updated to install version 6.8.0-10. RMagick won't install against that version, at least on OS X. Checking out the previous commit of the formula, which installs version 6.7.7-6, before installing ImageMagick via Homebrew and then installing RMagick worked like a charm, however.
I'm sure others have had to get around this as well, but the formula repository on GitHub was the only place I could find a discussion about the issue, and the author of the formula suggests using MiniMagick, which isn't an option for me.
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