Zope-btreefolder2

Running into a strange problem trying to install Plone via macports. The zope and zope-btreefolder2 ports seem to have some strange circular dependency. Whenever I try to activate the btreefolder2 install, I get: "Error: port activate failed: Image error: /opt/local/libexec/Zope/lib/python/Products/BTreeFolder2/__init__.py is being used by the active zope port. Please deactivate this port first, or use the -f flag to force the activation." I tried clean --all on both ports, but I keep getting this error. I can use the -f force option, but it reports a long list of files overwritten besides that one. Anybody see this before? Thanks.... --fb