How to change styles when rendering with Mapnik

I hope this is the right forum for this post.

I am running an Ubuntu tile server with PostgreSQL, mapnik, apache2 and mod_tile
Mapnik configured as so : http://wiki.openstreetmap.org/wiki/Mapnik#Rendering_with_Mapnik
Postgres configured as so : http://wiki.openstreetmap.org/wiki/Mapnik/PostGIS#Complete_Installation_for_Ubuntu

I can render files, and serve them normally using mod_tile on apache.

What I cannot seem to do is figure out how to render the tiles using the MapQuest styles.
I have done the following :

 
wget http://developer.mapquest.com/content/static/geotiffs/mercator_tiffs.tar
wget http://tile.openstreetmap.org/world_boundaries-spherical.tgz
wget http://tile.openstreetmap.org/processed_p.tar.bz2
wget http://tile.openstreetmap.org/shoreline_300.tar.bz2
wget http//www.naturalearthdata.com/download/10m/cultural/10m-populated-places.zip
wget http//www.naturalearthdata.com/download/110m/cultural/110m-admin-0-boundary-lines.zip

extracted them all into world-boundaries (one directory higher than generate_xml.py, and copied directory down to same level just in case)
When I execute the following command with the appropriate values changed

./generate_xml.py --host localhost --user `whoami` --dbname gis --symbols ./symbols/ --world_boundaries ./world_boundaries/ --port 5432 --password 'something'

it exits without error. My osm.xml file has been untouched, as evidenced by an old timestamp.
Rendering returns the same style map as the Standard on http://www.openstreetmap.org/

I’ve gotten quite close to achieving my goal. This last step, however, seems to be eluding me.

Any pointers would be greatly appreciated.

UPDATE

I’ve extracted the MapQuest styles and attempted to generate tiles:

mkdir -d MapQuest-Mapnik-Style && unzip MapQuest-MapQuest-Mapnik-Style-6f7ea27.zip -d MapQuest-Mapnik-Style
cd mapnik
 ./generate_xml.py ../MapQuest-Mapnik-Style/mapquest-us.xml osm.xml --dbname gis --user gisuser --accept-none
../MapQuest-Mapnik-Style/mapquest_inc/entities.xml.inc:2: I/O warning : failed to load external entity "../MapQuest-Mapnik-Style/mapquest_inc/settings.xml.inc"

Resolved.

Hi.

I have the same problem. I have a tile server according to http://switch2osm.org/ building manually. It is very hard to change styles manually. How do you solve the problem?

Thx

Moved this topic to Q&A