ImageMagick 6.7.6.3をインストールするよりもアンインストールするよりもImageMagick6.6.0-4をインストールしましたが、まだ古いものを使用しているので、この問題を解決するにはどうすればよいですか？
/var/lib/gems/1.8/gems/rmagick-2.13.1/lib/RMagick2.so: This installation of RMagick was configured with ImageMagick 6.7.6 but ImageMagick 6.6.0-4 is in use. (RuntimeError)
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:596:in `new_constants_in'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require'
from /var/lib/gems/1.8/gems/rmagick-2.13.1/lib/RMagick.rb:11
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:596:in `new_constants_in'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require'
from /var/lib/gems/1.8/gems/gruff-0.3.6/lib/gruff/base.rb:2
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:596:in `new_constants_in'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /var/lib/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require'
from /var/lib/gems/1.8/gems/gruff-0.3.6/lib/gruff.rb:25
from /var/lib/gems/1.8/gems/gruff-0.3.6/lib/gruff.rb:5:in `each'
from /var/lib/gems/1.8/gems/gruff-0.3.6/lib/gruff.rb:5
from /var/lib/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:68:in `require'
from /var/lib/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:68:in `require'
from /var/lib/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:66:in `each'
from /var/lib/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:66:in `require'
from /var/lib/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:55:in `each'
from /var/lib/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:55:in `require'
from /var/lib/gems/1.8/gems/bundler-1.1.3/lib/bundler.rb:119:in `require'
from /home/paladion/project/new-sprint/sprint-19/config/application.rb:14
from /var/lib/gems/1.8/gems/railties-3.0.7/lib/rails/commands.rb:28:in `require'
from /var/lib/gems/1.8/gems/railties-3.0.7/lib/rails/commands.rb:28
from /var/lib/gems/1.8/gems/railties-3.0.7/lib/rails/commands.rb:27:in `tap'
from /var/lib/gems/1.8/gems/railties-3.0.7/lib/rails/commands.rb:27
from script/rails:6:in `require'
from script/rails:6