your troubles come from the fact that our dosbox port is old, and requires i386, and your xcode doesnt (easily) support i386.
I had almost updated dosbox to the 64bit version, but never finished off the update. https://trac.macports.org/ticket/57235 that would likely be the easiest fix for you. otherwise you can downgrade to xcode 9 and the i386 builds will work again. explaining how to make xcode 10 build i386 is more than I'm going to takle on this ipad :) it is possible, though. at this moment you're pretty pickled, and will likely have to uninstall everything and start fresh. ken
