port build error -- avahi-app

[Ronald F. Guilmette]

Greetings,

I'm trying to build a port called "gthumb" and that is failing because
several of the prerequsites failed to build properly.  One of these
is something called "avahi-app".  I have no idea what this is, and
since I'm really just trying to build gthumb, I don't really care.
I just want to get it built.

Anyway, the build of avahi-app is dying during configuration as follows:


...
checking for pkg-config... /usr/local/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for GLIB20... yes
checking for GOBJECT... yes
checking for DBUS... yes
Error: Couldn't determine the version of your D-Bus package.
  This is probably an error in this script, please report it
  along with the following information:
      Base D-Buss version =''
      DBUS_VERSION_MAJOR='0'
      DBUS_VERSION_MINOR='0'
      DBUS_VERSION_MICRO='0'
===>  Script "configure" failed unexpectedly.
...


I there by any chance a simple/known fix for this?

I have no idea what D-Bus even is, let alone why it's version number is
unknown to the configure for avahi-app.

Any help appreciated.