imaxima: imath.el is being used by the active maxima port

[NiftyPan (Pan)]

I have tried to install 'imaxima' twice, once after having installed 'maxima', and after getting errors, I cleaned and reclaimed, uninstalled, reclaimed again, and tried to install 'imaxima' on its own (I noticed 'maxima' was one of its dependencies anyway). I got the same errors, one of which recommended I make a bug report. The errors I got both times were:

Error: Failed to activate imaxima: Image error: /opt/local/share/emacs/site-lisp/imath.el is being used by the active maxima port.  Please deactivate this port first, or use 'port -f activate imaxima' to force the activation.
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_imaxima/imaxima/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port imaxima failed