RMagickの履歴

Mac

$ C_INCLUDE_PATH=/usr/local/Cellar/imagemagick/6.8.8-9/include/ImageMagick-6 PKG_CONFIG_PATH=/usr/local/Cellar/imagemagick/6.8.8-9/lib/pkgconfig/ gem install rmagick -v '2.13.2'

CentOS

sudo yum install ImageMagick
してから
sudo gem install rmagick
する

ImageMagick
#wget http://jaist.dl.sourceforge.net/sourceforge/imagemagick/ImageMagick-6.2.9-4.tar.gz
#tar xvfz ImageMagick-6.2.9-4.tar.gz
#cd ImageMagick-6.2.9
#./configure --enable-shared
#make
#make install