No Suitable Image Found is displayed when "sudo port"

[njoneil@…]

noneil:~ noneil$ sudo port Password: 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: no matching architecture in universal wrapper

while executing

"load /opt/local/share/macports/Tcl/pextlib1.0/Pextlib.dylib"

("package ifneeded Pextlib 1.0" script) invoked from within

"package require Pextlib 1.0"

(file "/opt/local/bin/port" line 40)