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

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

[ebuild  N     ] x11-libs/libXinerama-1.1.6::gentoo  USE="-doc" 263 KiB
[ebuild  N     ] x11-wm/notion-4.0.5::gentoo  USE="nls" LUA_SINGLE_TARGET="lua5-4" 774 KiB

Total: 2 packages (2 new), Size of downloads: 1036 KiB