We have a postgres-databse under windows, that is version 9.1. From that we want to dump the data and import under a Linux-server, that runs Postgres 8.4. The data include spatial data with Postgis.
The problem is, that the dump doesn't import, as it uses commands like 'CREATE EXTENSION ..' that can't be understand on the older Postgres. Is there a way to transfer the data between these databases?