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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] sci-libs/geos-3.12.1::gentoo  USE="-doc -test" 6570 KiB

Total: 1 package (1 new), Size of downloads: 6570 KiB