RMagick complaining about libMagickCore.5.dylib not found in OSX

Question

after running brew upgrade imagemagick, when I run rails s I'll get

/Users/tomi/.rvm/gems/ruby-2.0.0-p247@ezaaa/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `require': dlopen(/Users/tomi/.rvm/gems/ruby-2.0.0-p247@ezaaa/gems/rmagick-2.13.2/lib/RMagick2.bundle, 9): Library not loaded: /usr/local/lib/libMagickCore.5.dylib (LoadError)
  Referenced from: /Users/tomi/.rvm/gems/ruby-2.0.0-p247@ezaaa/gems/rmagick-2.13.2/lib/RMagick2.bundle
  Reason: image not found - /Users/tomi/.rvm/gems/ruby-2.0.0-p247@ezaaa/gems/rmagick-2.13.2/lib/RMagick2.bundle

I'm using Carrierwave gem with RMagick, OS is OSX Moutain Lion

Answer 1

Anyone else struggling with this right now (Jan 2017) - RMagick 2.15.4 can't be built with ImageMagick 7.0.x

First, please do this:

brew uninstall ImageMagick
gem uninstall rmagick

Second, please see https://github.com/rmagick/rmagick/issues/256 and read the answer by hristozov, viz:

brew rm imagemagick
cd "$(brew --prefix)/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/"
git checkout 6f014f2b7f1f9e618fd5c0ae9c93befea671f8be imagemagick.rb
brew install imagemagick
brew pin imagemagick
git reset --hard

This will force homebrew to use /usr/local/Cellar/imagemagick/6.9.7-3

Third,

gem install rmagick