Activating dbus @1.4.20_0+startupitem fails

[Murray Eisenberg]

Immediately after running "sudo port selfupdate" with MacPorts 2.0.4 
under OS X 10.7.3, I ran "sudo port upgrade outdated". MacPorts 
proceeded to attempt to update dbus, but it failed:

--->  Computing dependencies for dbus
--->  Fetching archive for dbus
--->  Attempting to fetch 
dbus-1.4.20_0+startupitem.darwin_11.x86_64.tbz2 from 
http://packages.macports.org/dbus
--->  Fetching dbus
--->  Attempting to fetch dbus-1.4.20.tar.gz from 
http://ykf.ca.distfiles.macports.org/MacPorts/mpdistfiles/dbus
--->  Attempting to fetch dbus-1.4.20.tar.gz from 
http://distfiles.macports.org/dbus
--->  Verifying checksum(s) for dbus
--->  Extracting dbus
--->  Applying patches to dbus
--->  Configuring dbus
--->  Building dbus
--->  Staging dbus into destroot
--->  Installing dbus @1.4.20_0+startupitem
--->  Cleaning dbus
--->  Computing dependencies for dbus
--->  Deactivating dbus @1.4.18_0
--->  Cleaning dbus
--->  Activating dbus @1.4.20_0+startupitem
Error: Target org.macports.activate returned: could not set owner for 
file "/Library/LaunchAgents/org.freedesktop.dbus-session.plist": no such 
file or directory

Why and how to fix?

(I didn't install dbus directly myself, but I presume it was installed 
because qt4-mac depends upon it, and ipe upon that.)

-- 
Murray Eisenberg                     murrayeisenberg at gmail.com
80 Fearing Street                    phone 413 549-1020 (H)
Amherst, MA 01002-1912