bundle install するとよくでるこいつら
An error occurred while installing rmagick (2.15.4), and Bundler cannot continue.
Make sure that `gem install rmagick -v '2.15.4'` succeeds before bundling.
sudo yum -y install ImageMagick ImageMagick-devel
Bundle complete! 33 Gemfile dependencies, 105 gems now installed.
Use `bundle show [gemname]` to see where a bundled gem is installed.
だいたいこういうのは
なんちゃらdevel
をいれればOK