Mavericks buildbot issue with dbus

[Michael Dickens]

I'm getting the following back when it tries to build a port that
depends on dbus:
{{{
Error: org.macports.activate for port dbus returned: could not set owner
for file "/opt/local/var/run/dbus": user "messagebus"; does not exist
}}}

The dbus port contains the following code:
{{{
set dbus_user     messagebus
set dbus_group    messagebus
add_users         ${dbus_user} group=${dbus_group} realname=Message\ Bus
set startup_root  ""
}}}

Anyone have an idea what to do to fix this? - MLD