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

Calculating dependencies ... done!
Dependency resolution took 1.05 s (backtrack: 0/20).

[ebuild  N     ] acct-group/named-0-r3::gentoo  0 KiB
[ebuild  N     ] dev-libs/userspace-rcu-0.15.6:0/8::gentoo  USE="-static-libs -test -verify-sig" 670 KiB
[ebuild  N     ] acct-user/named-0-r3::gentoo  0 KiB
[ebuild  N     ] net-dns/bind-9.20.29::gentoo  USE="-dnstap -doc -doh -fixed-rrset -geoip -gssapi -idn (-jemalloc) -lmdb (-selinux) -systemtap -test -verify-sig -xml" 5827 KiB

Total: 4 packages (4 new), Size of downloads: 6497 KiB