Hi Hans,
FYI there was a missing dependency while installing Pd-0.41.0-extended-20071209-debian-testing-i386.deb) under lenny : libgsl0
Plus I had to apt-get install tcl8.5 tk8.5
Hope this helps for fine-tuning ;-)
I used to run the Geiger's 0.40-2 package before.
Bye O.