Regarding the projection of Mapnik's processed _p shp...

Hi everyone, I was wondering if anyone knows the accurate projection for the processed_p.shp coastline data? The coordinates seem way off even after I tried to define the projection as spherical Mercator. Need help!

I think this is the correct projection, which should work with proj4, etc:

#define SR_ORG_6_SRS “+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over”