We don't have packaged PostgreSQL option for PAM authentication. This is serious omission.

Create a pkgsrc package for http://sourceforge.net/projects/pam-pgsql/ (pkgsrc is NetBSD-originated portable framework for building software packages.)

Provide instructions how to test its functionality (smoke test).

It is possible that you run into blocking problem. Problem report that includes description of problem, step-by-step instructions to reproduce it, and explanation why it is considered blocking is accepted as successful task completion.

References

1. The pkgsrc Guide: http://www.netbsd.org/docs/pkgsrc/

2. pkgsrc targets for impatient: http://wiki.netbsd.org/pkgsrc/targets

3. Similar packages: security/pam-ldap, security/pam-mysql, other security/pam-* packages.