BUG #6688: can't install from binary.

The following bug has been logged on the website:

Bug reference:      6688
Logged by:          Rob
Email address:      omnis@ra1.net
PostgreSQL version: 9.1.4
Operating system:   OSX 10.4.11
Description:=20=20=20=20=20=20=20=20

Hi,

I get an error when trying to run the 9.1.4 installer binary
(postgresql-9.1.4-1-osx.app) on my Mac PowerBook PPC running OS X 10.4.11.=
=20

It says, "Bad CPU type in executable."

Your download page says that OS X 10.4 on PPC is supported --   "A one click
installer is available for for Mac OS X 10.4 and above on Intel and PPC and
includes PostgreSQL, pgAdmin, PL/Java and the PL/pgSQL debugger plugin.'
http://www.postgresql.org/download/macosx/

What am I missing?  Or what might I be doing wrong?  I simply downloaded the
disk image and tried to run the installer.

Thanks a lot.
Rob