Update to latest release 7.4.2.
Release notes available at http://www.postgresql.org/news/173.html
NOTICE: unlike most minor versions, this version does require
some updates to the pg_* system tables. Full instructions for
how to do this are included in the full HISTORY file.
DO NOT UPGRADE WITHOUT READING THESE INSTRUCTIONS.
Submitted by: Palle Girgensohn <email@example.com> (maintainer)