Breakage in Leopard - RMagick fails to find libdpstk.1.dylib

Some small breakage in Leopard - it seems a couple of parts of X11 have been removed. Starting my rails setup, which has GraphicsMagick installed (read here for how), results in this:
dyld: NSLinkModule() error
dyld: Library not loaded: /usr/X11R6/lib/libdpstk.1.dylib
  Referenced from: /usr/local/lib/ruby/gems/1.8/gems/rmagick-1.15.9/lib/RMagick.bundle
  Reason: image not found
Trace/BPT trap
Those dylib files do not exist any more. But... I have a backup (I hope you do). I ended up doing this:
$ cd /Volumes/BackupDisk/usr/X11R6/lib
$ sudo cp libdps*1.0* /usr/X11R6/lib/
$ sudo ln -s /usr/X11R6/lib/libdpstk.1.0.dylib /usr/X11R6/lib/libdpstk.1.dylib
$ sudo ln -s /usr/X11R6/lib/libdps.1.0.dylib /usr/X11R6/lib/libdps.1.dylib
All fixed. Without a backup you are going to need to find those two files from somewhere. I'm not sure I can legally post them here, but email me if you are stuck.