I have tried it as well with the Diablo files.
Same error:

root@Nokia-N900-42-11/>setxkbmap -device 4 -I -I/usr/share/X11/xkb-diablo -rules base -model pc105 -layout us -v 10
Setting verbose level to 10etxkbmap -device 4 -I -I/usr/share/X11/xkb-diablo -rules base -model pc105 -layout us -v 10
locale is C
Warning! Multiple definitions of rules file
Using command line, ignoring X server
Warning! Multiple definitions of keyboard model
Using command line, ignoring X server
Warning! Multiple definitions of keyboard layout
Using command line, ignoring X server
Applied rules from base:
model: pc105
layout: us
Trying to build keymap using the following components:
keycodes: evdev+aliases(qwerty)
types: complete
compat: complete
symbols: pc+us
geometry: pc(pc105)
Error loading new keyboard description