Created attachment 667196 [details]
I made a trivial update to dev-db/postgis-3.0.2 to support the sfcgal USE flag. I did not bump the revision because sfcgal is a new USE flag, any postgis user should see no change in their package unless this flag is turned on.
When this flag is enabled sci-mathematics/sfcgal (ticket 750242) and thus the updated sci-mathematics/cgal (ticket 750233) will be added as dependencies, and postgis will then build with the optional postgis_sfcgal extension.
No existing databases will be updated unless this extension is first enabled, however this extension is required by many GIS tools - especially those which render maps in 3d.