Issue with fontconfig and Snow Leopard

[Doctor Who]

I'm trying to do an upgrade of my installed ports since upgrading to
Snow Leopard and I'm getting the following error with fontconfig:

$ sudo port upgrade outdated
--->  Computing dependencies for fontconfig
--->  Extracting fontconfig
Error: You cannot install fontconfig for the architecture(s) x86_64
because /opt/local/lib/libexpat.dylib does not contain the architecture x86_64.
Error: Target org.macports.extract returned: incompatible
architectures in dependencies
Error: Unable to upgrade port: 1

This is MacPorts 1.8.1

What is the preferred method to fix this?

Thanks!