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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] sci-libs/libaec-1.1.4:0/2::gentoo  USE="szip -test" 2260 KiB
[ebuild  N     ] virtual/szip-2.1:0/2::gentoo  0 KiB

Total: 2 packages (2 new), Size of downloads: 2260 KiB