Thanks Eric. Your reply prompted me to see how many ruby were installed
on my PB.

Seems I had 2:
/local/bin/ruby
/bin/ruby
------
tripus% ./bin/ruby -v
ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0]
tripus% ./bin/ruby -e 'p "test".rjust(5,"x")'
"xtest"

tripus% ./local/bin/ruby -v
ruby 1.8.2 (2004-11-03) [powerpc-darwin7.5.0]
tripus% ./local/bin/ruby -e 'p "test".rjust(5,"x")'
" test"
----
No idea where the second one is coming from.
Thanks for the feedback - Martin