---> Activating imath @3.1.12_0 Error: Failed to activate imath: The following ports have active files that conflict with imath's: ilmbase @2.3.0_1 /opt/local/lib/libImath.dylib
This is <https://trac.macports.org/ticket/68111>. According to one of the imath maintainers in the ticket, it only happens if you haven't upgraded in over a year.
Running 'sudo port migrate' may be the most reliable way to upgrade a very old installation.
- Josh
