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

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild  N     ] mail-filter/libmilter-1.0.2_p4:0/1.0.2_p4::gentoo  USE="ipv6 -poll" 2346 KiB

Total: 1 package (1 new), Size of downloads: 2346 KiB