Error : No such file found hstore.control in postgresql database

gistfile1.txt

I have setup a new database for installing Discourse in PostgreSQL. When I run rake db:migrate, it creates most of the tables, but it then fails:

execute("CREATE EXTENSION IF NOT EXISTS hstore")
rake aborted!
An error has occurred, this and all later migrations canceled:

PG::Error: ERROR:  could not open extension control file "/usr/share/postgresql/9.1/extension/hstore.control": No such file or directory
: CREATE EXTENSION IF NOT EXISTS hstore

Soln:

     On Ubuntu, you need to install the extension by installing the postgresql-contrib package.

             sudo apt-get install postgresql-contrib