Then I followed the link to the Pharo VM download
(
http://pharo.org/download), downloaded
the OS X package by clicking on the OS X 'button', and executed the
Gofer statement from the website.
Everything downloaded and installed fine.
But when I tried to run any of the Roassal demos a debugger window opened
complaining about some cairo method which could not be found.
With 10.6 you'll have problems with the cairo plugin.