Rmagick gem auf Ubuntu 14.04 installieren

Ich versuche, eine App auf OpsWorks bereitzustellen, aber es gibt Probleme bei der Installation von rmagick gem. Ich habe folgende OS-Pakete: 

libmagickwand-dev imagemagick libmagickcore-dev

Unten ist die Protokolldatei mit Fehlern während der Bereitstellung:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

/usr/local/bin/Ruby extconf.rb
checking for Ruby version >= 1.8.5... yes
checking for gcc... yes
checking for Magick-config... no
Can't install RMagick 0.0.0. Can't find Magick-config in /usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games

*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--Ruby=/usr/local/bin/Ruby

extconf failed, exit code 1

Gem files will remain installed in /home/deploy/.bundler/myapp/Ruby/2.1.0/gems/rmagick-2.13.3 for inspection.
Results logged to /home/deploy/.bundler/myapp/Ruby/2.1.0/extensions/x86_64-linux/2.1.0/rmagick-2.13.3/gem_make.out
An error occurred while installing rmagick (2.13.3), and Bundler cannot
continue.
Make sure that `gem install rmagick -v '2.13.3'` succeeds before bundling.
STDERR:
---- End output of Sudo su - deploy -c 'cd /srv/www/myapp/releases/20140929182350 && /usr/local/bin/bundle install --path /home/deploy/.bundler/myapp --without=test development' 2>&1 ----
Ran Sudo su - deploy -c 'cd /srv/www/myapp/releases/20140929182350 && /usr/local/bin/bundle install --path /home/deploy/.bundler/myapp --without=test development' 2>&1 returned 5
[2014-09-29T18:24:08+00:00] FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit code 1)