Version 8.3.2 is available upstream. Please consider updating! It seems that version 8.3.2 is available upstream, while the latest version in the Gentoo tree is 8.3.1. You think this warning is false? Read more about it here.
The original GIS, yes the first one, developed by the US
Army Corp of Engineers, now an active free and open source GIS. See the GRASS Documentation
Project for more info https://grass.osgeo.org/.