Wrong SFCGAL version used for compiling PostGIS 3.6.0 on Ubuntu?

[Greg Troxel]

Scott <public at postholer.com> writes:

> Postgis configure is robust and allows you to set/unset all sorts of
> things, including rpath. Mine looks like:
>
> ./configure \
>    --prefix=/export/gis/local \
>    --with-gdalconfig=/export/path/bin/gdal-config \
>    --with-geosconfig=/export/path/bin/geos-config \
>    --with-pgconfig=/usr/lib/postgresql/15/bin/pg_config \
>    --with-sfcgal=/export/path/bin/sfcgal-config

I'm assuming /export/path is the prefix for which you compiled those 4,
and you are trying to put postgis under /export/gis.

> The problem is the environment. When I do an ldd on the newly built
> postgis-3.so, all the paths are correct *if* in my user environment.
> From another user, the paths default to the system pkg path where the
> older geos 3.11 version is installed.

That's a clue that there is LD_LIBRARY_PATH set somehow.  See my first
message about objdump.  Unfortunately I think the only way to get
through this is to understand how dynamic linking is working.

(Of course, you may find that Debian says that RPATH is bad and
LD_LIBRARY_PATH is the right thing to do.  I'm really unclear on their
doctrine, and I hope my impressions are confused.)

You should also save the build logs, and look at the rpath arguments on
the link lines.  You probably have to set CMAKE_VERBOSE or some such,
because people these days seem to think that hiding actual build
commands is a good thing.