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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] acct-group/radvd-0-r2::gentoo  0 KiB
[ebuild  N     ] acct-user/radvd-0-r2::gentoo  0 KiB
[ebuild  N     ] net-misc/radvd-2.20::gentoo  USE="(-selinux) -test" 185 KiB

Total: 3 packages (3 new), Size of downloads: 185 KiB