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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/atk-2.38.0::gentoo  USE="-gtk-doc -introspection" 297 KiB

Total: 1 package (1 new), Size of downloads: 297 KiB