XCode install requires Unix Development Support (install option) (to compile downloaded SW).
(for us non-geeks with legacy machines/limited memory: can't skimp here! I learned hard way.)
In addition, even for geeks, currently (as of August 4 2009), the compilation of goffice causes problems. I needed to apply the patch from http://lists.macosforge.org/pipermail/macports-users/attachments/20090520/03dbddc6/attachment.obj
dbus still seems to require some messing about. Rebooting did not work for me, so I uninstalled gnucash, reinstalled dbus, and rebuilt gnucash but this still didn't work.
After a lot of messing about I think the answer is to NOT do sudo launchctl load -w /Library/LaunchDaemons/org.freedesktop.dbus-system.plist
launchctl load -w /Library/LaunchAgents/org.freedesktop.dbus-session.plist
although I certainly wouldn't guarantee it.
It would really be good if this could be made more reliable. I'm a long term gnucash user on linux, but have moved to Mac OS X and don't really want to transfer to another programme.
I've noticed (after a week) that find doesn't work on the port that I build. It brings up the dialog box but one can't actually type a string into the text box! No idea what this could be.