Built for Tiger and Leopard.
PostgreSQL itself does not require anything extra, and includes the Pl/Python language. Initial database setup is done for you if you have never installed Postgres before.
The PostGIS extension requires the GEOS 3 and PROJ frameworks. The pgRouting extension does not require anything extra, though it can use PostGIS. All extensions require the Postgres server.
psql), try manually initializing the cluster with:sudo su - postgres -c "/usr/local/pgsql/bin/initdb \ -D /usr/local/pgsql/data --encoding=UTF8 --locale=en_US"
Or see the Locales and Encodings readme if you need a different locale or encoding.
Then stop and start Postgres as specified in the readme.
Built for Tiger and Leopard.
Same requirements as 8.3.