[postgis-users] could not find function "centroid" in file "/usr/lib/postgresql/postgis.dll"

[Rudolf Nottrott]

I installed PostGIS with PostgreSQL on Windows XP / Cygwin, after switching 
off proj4 and geos in the Makefile (USE_PROJ=0 and
USE_GEOS=0).  I switched off proj4 and geos because I was getting PostGIS 
compilition errors without them installed, and I felt a bit daunted 
about  two more installs.

WIth
USE_PROJ=0 and USE_GEOS=0
PostGIS  compiles and installes ok -- I just wanted to get the basic 
PostGIS going first.

Unfortunatley, now when loading the postgis.sql definitions file
psql    -d   drg_usgs   -f   postgis.sql
I get an error

could not find function "centroid" in file "/usr/lib/postgresql/postgis.dll"

Any idea what that means, and what to do?

Thanks,

Rudolf

P.S.  I thought that perhaps it relates to the uninstalled geos, so I 
downloaded and unpacked geos, but then found no installation instructions 
for it (only an empty README file).

>Subject: RE: Using/Compiling PostGIS on WindowsXP/Cygwin for use with 
>PostgreSQL
>Date: Fri, 25 Jun 2004 17:45:25 -0600
>From: "Chapman, Martin" <MChapman at sanz.com>
>To: "PostGIS Users Discussion" <postgis-users at postgis.refractions.net>
>
>That is correct, fortunately the builds for these projects are really
>good and work on both linux and windows.  Just download them and follow
>the build instructions.  It's easier than you might think.
>
>Martin
>
>-----Original Message-----
>From: Rudolf Nottrott [mailto:rnott at alexandria.UCSB.edu]
>Sent: Friday, June 25, 2004 5:25 PM
>To: PostGIS Users Discussion
>Subject: RE: [postgis-users] Using/Compiling PostGIS on WindowsXP/Cygwin
>for use with PostgreSQL
>
>Are you saying that proj4 and geos are required to run
>PostGIS with PostgreSQL on Windows/Cygwin?
>
>Are they also required to run PostGIS with PostgreSQL on other
>platforms, in particular Linux?
>
>If so, that adds up to quite an installation chore, mostly because of
>the potential errors that can occur.
>I feel a bit daunted!
>
>Rudolf
>
>At 05:01 PM 6/25/2004 -0600, you wrote:
> >You need to download and install proj4.  It's the projection library
> >used by postgis to handle projecting lat/lons into x,y and the inverse.
>
> >The zip can be found at http://www.remotesensing.org:16080/proj/ .
> >Follow the build instructions for windows using the vc compiler.  Let
> >me know if you have problems.  You also need geos which can be found at
>
> >http://geos.refractions.net .
> >
> >Martin Chapman