$ sudo rpm -i http://yum.postgresql.org/9.3/redhat/rhel-6-x86_64/pgdg-redhat93-9.3-1.noarch.rpm
$ sudo yum update
$ sudo yum install -y postgresql93-server postgresql93-contrib postgresql93-client
$ psql -d {database_name} -f /usr/pgsql-9.3/share/extension/hstore.sql