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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/utfcpp-4.0.6::gentoo  USE="-test" 34 KiB
[ebuild  N     ] sci-misc/lttoolbox-3.8.2:0/3::gentoo  USE="-test" 154 KiB
[ebuild  N     ] sci-misc/apertium-3.9.12:0/3::gentoo  USE="-test" 564 KiB

Total: 3 packages (3 new), Size of downloads: 751 KiB