BUG #6549: Wrong $PATH setting after installation

The following bug has been logged on the website:

Bug reference:      6549
Logged by:          Jelle Frans van der Woude
Email address:      jf.vanderwoude@gmail.com
PostgreSQL version: 9.1.2
Operating system:   OS X Snow Leopard
Description:=20=20=20=20=20=20=20=20

I've installed pg from the www.kyngchaos.com site. After installation, I've
checked the $PATH setting in terminal by $ echo $PATH
/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/pgsql/binbin:/sbin:=
/usr/X11/bin.

Notice the wrong 'binbin' setting. How to correct this?