Just a quick reminder to myself on how I installed RMagick on a Debian 5.0.4 “lenny” VPS. All commands to be run as root.
Build ImageMagick from source
curl -O ftp://ftp.imagemagick.org/pub/ImageMagick/ImageMagick.tar.gz tar xvzf ImageMagick.tar.gz -C /usr/src/ cd /usr/src/ImageMagick-6.6.6-6/ ./configure make make install
Install the RMagick Gem
gem install rmagick
As an interesting aside, ImageMagick handles a lot of image formats via delegate libraries. I previously installed RMagick on a CentOS box and had to separately install TrueType fonts which were necessary for the project in question. These had to be installed before ImageMagick and were accessible through yum and the xorg-x11-fonts-truetype package.