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

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

[ebuild  N     ] dev-libs/c-stdaux-1.6.0::gentoo  24 KiB
[ebuild  N     ] dev-libs/c-siphash-1.1.0-r1::gentoo  9 KiB

Total: 2 packages (2 new), Size of downloads: 32 KiB