= 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 proj libjson0-dev
}}}

Optional package for raster support:
{{{
sudo apt-get install libgdal-dev
}}}
Optional packages for testing PostGIS:
{{{
sudo apt-get install libcunit1-dev
}}}
Optional packages for building documentation:
{{{
sudo apt-get install xsltproc docbook-xsl docbook-mathml imagemagick
}}}
(for building PDF documentation, add `dblatex`, but expect a large download)


=== Build GEOS 3.3.2 ===
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-3.3.2.tar.bz2
tar xvfj geos-3.3.2.tar.bz2
cd geos-3.3.2
./configure
make
sudo make install
}}}

== Build PostGIS ==
{{{
wget http://postgis.refractions.net/download/postgis-2.0.0beta2SVN.tar.gz
tar xfvz postgis-2.0.0beta2SVN.tar.gz
cd postgis-2.0.0beta2SVN
}}}
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 make comments-install
}}}

== Template ==
Complete a post-install by creating 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:
{{{
createdb template_postgis
createlang plpgsql 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
}}}

=== Enable raster extension ===
Adding on to `template_postgis`:
{{{
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
}}}

=== Enable topology extension ===
Adding on to `template_postgis`:
{{{
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
}}}