Installation on OsX 10.5

[Frank Tabakin]

I tried to install macports using the MacPorts 1.6.0.pkg
on a system with
Mac Os X 10.5.2

Xcode 3.0

X11 2.1.1
I also updated the Xcode with a March 8 posting.

Got the message:

"Install failed

The following install step failed:  run postflight script
for MacPorts.  Contact the software manufacturer for assistance"
On the macport installer window.

What should I do next?
I couldn't find the postflight script.

I did run following,  which probably should tell me what to do,
but I need some guidance:
========================
sudo ./port selfupdate
couldn't load file "/opt/local/share/macports/Tcl/pextlib1.0/ 
Pextlib.dylib": dlopen(/opt/local/share/macports/Tcl/pextlib1.0/ 
Pextlib.dylib, 10): no suitable image found.  Did find:
	/opt/local/share/macports/Tcl/pextlib1.0/Pextlib.dylib: mach-o, but  
wrong architecture
     while executing
"load /opt/local/share/macports/Tcl/pextlib1.0/Pextlib.dylib"
     ("package ifneeded" script)
     invoked from within
"package require Pextlib 1.0"
     (procedure "mportinit" line 382)
     invoked from within
"mportinit ui_options global_options global_variations"
Error: ./port: Failed to initialize MacPorts, couldn't load file "/opt/ 
local/share/macports/Tcl/pextlib1.0/Pextlib.dylib": dlopen(/opt/local/ 
share/macports/Tcl/pextlib1.0/Pextlib.dylib, 10): no suitable image  
found.  Did find:
	/opt/local/share/macports/Tcl/pextlib1.0/Pextlib.dylib: mach-o, but  
wrong architecture
Macintosh:bin franktabakin$ pwd
/opt/local/bin
=================================
Thanks for any help.
Frank