[postgis-users] How can I update proj4 without recompile

Paul Ramsey pramsey at cleverelephant.ca
Tue Nov 28 14:10:38 PST 2017

Hi Guido,
Knowing your use case ("wanting to avoid bad area calculations in
geodetics"), I can say definitively that you're out of luck. Just
replacing the library file won't do the trick, as the code in PostGIS
that uses the new proj geodetic area calculations won't be activated
with anything less than a rebuild.

On Tue, Nov 28, 2017 at 9:59 AM, Guido Stein <gstein at appgeo.com> wrote:
> Hey folks,
> I am trying to update the proj4 libraries on my postgis because I think the
> older version of proj4 is giving me faulty areas (known bug). I would like
> to go from 4.8 to 4.9.
> In talking to some friends I found out that I can make a sym link from the
> existing proj4 to a newly compiled proj4 without an issue. But, I can't seem
> to figure that out completely and need a little help.
> # Here is what is running on my system:
> select version();
>     PostgreSQL 9.5.10 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu
> 4.8.4-2ubuntu1~14.04.3) 4.8.4, 64-bit
> select postgis_full_version();
>     POSTGIS="2.3.3 r15473"
>     GEOS="3.4.2-CAPI-1.8.2 r3921"
>     PROJ="Rel. 4.8.0, 6 March 2012"
>     GDAL="GDAL 1.10.1, released 2013/08/26"
>     LIBXML="2.9.1"
>     LIBJSON="0.11.99"
>     RASTER
> # here is what I have done so far:
> - locate the directory of the postgis
>     pg_congif --pkglibdir
> - get information about what libraries are associated with postgis
>     ldd postgis-2.3
>         libproj.so.0 => /usr/lib/libproj.so.0 (0x00007ff19e1dd000)
> # this is where I loose the thread
> I don't know if when I make install if there should be a file I need to link
> here?? Yeah I need a clue and would be grateful for any assistance on this.
> -guido
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