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

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

[ebuild  N     ] acct-group/oidentd-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/oidentd-0-r3::gentoo  0 KiB
[ebuild  N     ] net-misc/oidentd-3.0.0-r1::gentoo  USE="ipv6 -debug -masquerade (-selinux)" 183 KiB

Total: 3 packages (3 new), Size of downloads: 183 KiB