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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/argtable-2.13-r4::gentoo  USE="-debug -doc -examples -static-libs" 3249 KiB
[ebuild  N     ] sci-biology/clustal-omega-1.2.4-r1::gentoo  1144 KiB

Total: 2 packages (2 new), Size of downloads: 4392 KiB