= How to install PostGIS 2.0 on Debian 6.0 (''squeeze'') from source =

== Prerequisites ==

Several components are needed, which can either be built from source or installed from pre-built packages, as shown below. It is assumed you have already installed and configured `sudo` (not done by default).

Install prerequisite packages using:
{{{
sudo apt-get install build-essential postgresql-8.4 postgresql-server-dev-8.4 libxml2-dev libproj-dev libjson0-dev xsltproc docbook-xsl docbook-mathml
}}}

Optional package for raster support (recommended):
{{{
sudo apt-get install libgdal-dev
}}}

=== Build GEOS 3.3.x ===
PostGIS 2.0 requires GEOS >= 3.3.2 for topology support.

There are multiple ways to build GEOS, but this is the simplest:
{{{
wget http://download.osgeo.org/geos/geos-3.3.9.tar.bz2
tar xfj geos-3.3.9.tar.bz2
cd geos-3.3.9
./configure
make
sudo make install
cd ..
}}}

== Build PostGIS ==
{{{
wget http://download.osgeo.org/postgis/source/postgis-2.0.3.tar.gz
tar xfz postgis-2.0.4.tar.gz
cd postgis-2.0.4
}}}
PostGIS 2.0 can be configured to disable topology or raster extensions, using the configure flags `--without-raster` and `--without-topology`. The default is to build both extensions:
{{{
./configure
make
sudo make install
sudo ldconfig
sudo make comments-install
}}}

Lastly, enable the command-line tools to work from your shell:
{{{
sudo ln -sf /usr/share/postgresql-common/pg_wrapper /usr/local/bin/shp2pgsql
sudo ln -sf /usr/share/postgresql-common/pg_wrapper /usr/local/bin/pgsql2shp
sudo ln -sf /usr/share/postgresql-common/pg_wrapper /usr/local/bin/raster2pgsql
}}}

== Using enabler scripts ==

Enabler scripts can be used to either build a template, or directly spatially enable a database.

The following example creates a template, which can be re-used for creating multiple spatially-enabled databases. Or if you just want to make one spatially enabled database, you can modify the commands for your needs.

Log-in as `postgres` from `root` using "`su - postgres`", and use the following commands. Install PostGIS:
{{{
createdb template_postgis
createlang plpgsql template_postgis
psql -d template_postgis -c "UPDATE pg_database SET datistemplate=true WHERE datname='template_postgis'"
psql -d template_postgis -f /usr/share/postgresql/8.4/contrib/postgis-2.0/postgis.sql
psql -d template_postgis -f /usr/share/postgresql/8.4/contrib/postgis-2.0/spatial_ref_sys.sql
psql -d template_postgis -f /usr/share/postgresql/8.4/contrib/postgis-2.0/postgis_comments.sql
}}}

with raster support:
{{{
psql -d template_postgis -f /usr/share/postgresql/8.4/contrib/postgis-2.0/rtpostgis.sql
psql -d template_postgis -f /usr/share/postgresql/8.4/contrib/postgis-2.0/raster_comments.sql
}}}

with topology support:
{{{
psql -d template_postgis -f /usr/share/postgresql/8.4/contrib/postgis-2.0/topology.sql
psql -d template_postgis -f /usr/share/postgresql/8.4/contrib/postgis-2.0/topology_comments.sql
}}}