How to import a dump in Postgres from a newer version?
Solution 1:
You have two choices:
1) Install on Linux Postgresql v9.1
2) Remove from dump every command, which Postgresql v8.4 doesn't know.
EDIT:
You can do two exports - first only structure of database (pg_dump -s) and then only data (pg_dump -a). Then you can edit only one file...