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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] net-firewall/arptables-0.0.5-r2::gentoo  USE="-verify-sig" 52 KiB

Total: 1 package (1 new), Size of downloads: 52 KiB