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These are extension modules for PostgreQL 9.1 to allow postgis modules to be installed using standard PostgreSQL 9.1+ CREATE EXTENSION syntax To use: first make install regular PostGIS. Also make sure to make the comments if you are building from teh source repository since the extensions package the postgis function descriptions. make comments Makign the comments is not necessary if you are building from the tar balls since the tar balls have the various postgis_comments.sql, topology_comments.sql, and raster_comments.sql already built. Then: cd extensions/postgis make install cd .. cd extensions/postgis_topology make install These should automatically get installed in share/extension folder of PostgreSQL 9.1. Then in your PostgreSQL database run CREATE EXTENSION postgis; CREATE EXTENSION postgis_topology; The dependency logic should warn if you try to install postgis_topology without postgis or try to drop postgis without first droping postgis_topology. You will also not be able to drop any postgis functions installed by the extension. If you want to manually install the extensions from one server to another , just copy over the extensions/postgis: postgis.control, sql/* extension/postgis_topoloyg postgis_topology.control,sql/* files into your PostgreSQL/share/extension folder.