I recently tried to get this working on the N9 / N950 but am now stuck because it seems impossible to get double buffering to work as the "dbe" module is missing from X11. I think we will find a solution but cannot guarantee it. Flickering conky is still better than no conky, so if anyone wants to try it, here's a link: http://www.appcheck.net/storage/headache.zip
DONT install that on an n900, it's got enough changes made to it that it won't work.
DO dpkg -i all 3 debs from the command line, conky last, and if it has any other missing stuff you can probably apt-get install them.