Here's how I made it:
bunzip2 italy.osm.bz2(this might not be needed)
- setup mapnik; the instructions for sid worked on my lenny/testing system.
osm2pgsql -c /store/italy.osm(you should not use -m with gpsdrive)
- start gpsdrive and turn on mapnik mode. Originally it did not work for me,
until I deleted
This makes gpsdrive not only more useful, but also completely Free.