It looks like it can be compiled from source, but if you don't want to do this you can always run a Linux distribution in a virtual machine (such as VirtualBox) and it would be free. That's what I'd do.
If you haven't already done the base install for macports, just follow the directions found on macports.org. Once all the base stuff is installed, then use the command "sudo port install octave". I did not install the octave-devel package, just octave. It does appear that the current revision in macports is 3.6.2 as you said.
If you haven't already done the base install for macports, just follow the directions found on macports.org. Once all the base stuff is installed, then use the command "sudo port install octave". I did not install the octave-devel package, just octave. It does appear that the current revision in macports is 3.6.2 as you said.
Thanks for following up and letting me know about that. I checked on the macports web site and they didn't mention anything about problems with ML. I'm still on Lion and will wait to upgrade to ML until I know macports will work.