The simplest thing to do is just copy either this one line, or everything, from 
your esri projection file to your epsg projection file.

Something like:

cat /usr/local/share/proj/esri >> /usr/local/share/proj/epsg

might even do it well enough - though, there might be conflicts, so it's 
probably better to just copy the one line that you need.

Chris

Quoting Steffen Koehler <skoehler@buschjena.de>:

> Hello,
> 
> I have installed postgis 0.8, proj 4.4.7 and mapserver 4.0
> And I have data from germany with the following esri-prj description
> --------
> PROJCS["Germany_Zone_3",GEOGCS["GCS_Deutsche_Hauptdreiecksnetz",DATUM
["D_Deutsche_Hauptdreiecksnetz",SPHEROID
["Bessel_1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0.0],UNIT
["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER
["False_Easting",3500000.0],PARAMETER["False_Northing",0.0],PARAMETER
["Central_Meridian",9.0],PARAMETER["Scale_Factor",1.0],PARAMETER
["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]
> ---------
> 
> I found this in the postgis spatial_ref_sys table as EPSG:31493. But in the
> proj-files there is no EPSG:31493, I must use the ESRI:31493 entry to show
> this data correct with mapserver.
> Where is the mistake? Is the spatial_ref_sys-table false or the proj-files.
> 
> Can UMN-Mapserver use the entry from spatial_ref_sys for displaying data.
> If this not so, how can I create dynamic maps with different layers from
> postgis with the correct projection.
> 
> Thank
> Steffen
> 
> 
> _______________________________________________
> postgis-users mailing list
> postgis-users@postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-users
> 





