freeciv SDL - blank screen on Mojave/Catalina

[Dennis van der Burg]

Since upgrading to Mojave, when doing a fresh MacPorts install and then installing freeciv (SDL client) and clicking on the Apps>MacPorts>Freeciv icon, only a blank screen opens instead of a screen with the game running in it.

Has anyone else seen this too? Any ideas how to solve this? This package is currently listed on the MacPorts website as having no maintainer.

Kind regards,
Dennis