The following bug has been logged on the website:
Bug reference: 8177
Logged by: stronny
Email address: stronny@celestia.ru
PostgreSQL version: 9.2.4
Operating system: wheezy
Description: =
When installed from apt.postgresql.org Postgres fails to start on system
boot.
Wheezy changed /var/run to become memory-based so initscript should create
/var/run/postgresql if necessary.