As seen in the screenshot all lines between civs are missing. I can't even see which ones I'm at war with. But more important I can't see agreements between others. Also when a settler is moving around the borders of city plant is not showing. I'm playing Civ 3 Complete from GOG using Portingkit on a MacBook M1Pro. Was thinking that there might be some graphic lib missing that is used to draw these lines. Any ideas?

and I am sorry, that I cannot help you with your Mac problem. For pcs your screenshot would show a graphical disaster. May be you should post your problem at the Civ 3 Macintosh forum of CFC, that you can find here: 