After installing Leopard on my Mac I decided to install the annoying RMagick and it’s dependences because I use it quite alot in my web apps for resizing images, cropping and so on. (Leopard already came with Ruby installed, woohoo!)
Unfortunately it’s still a game of luck, pacience and preseverance. Luckily I followed the tutorial at onRails.org and managed to get things running after some time installing everything by hand from the source.
Here is my tutorial to install RMagick on a Mac
http://bcaccinolo.wordpress.com/2010/11/09/install-rmagick-on-mac-os-x/