Version 2020.4.0 is available upstream. Please consider updating! It seems that version 2020.4.0 is available upstream, while the latest version in the Gentoo tree is 2020.3.19. You think this warning is false? Read more about it here.
SimGear is a set of open-source libraries designed to be used as building blocks for
quickly assembling 3d simulations, games, and visualization applications.