These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] sci-libs/geos-3.14.1::gentoo  USE="-doc -test" 6850 KiB
[ebuild  N     ] sci-geosciences/librttopo-1.1.0::gentoo  295 KiB

Total: 2 packages (2 new), Size of downloads: 7144 KiB