Can’t install RMagick 2.13.2. Can’t find Magick-config

[root@dev redmine-2.3]# gem install rmagick
Building native extensions.  This could take a while...
ERROR:  Error installing rmagick:
ERROR: Failed to build gem native extension.
/usr/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 2.13.2. Can't find Magick-config in /home/hadoop/hive/bin:/usr/local/apache-maven-3.1.1/bin:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/jdk/bin:/bin:/home/hadoop/2.2.0/bin:/home/hadoop/2.2.0/sbin:/root/bin
*** 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/bin/ruby
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/rmagick-2.13.2 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/rmagick-2.13.2/ext/RMagick/gem_make.out

ImageMagick 를 설치하면 해결 됩니다.