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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] net-firewall/shorewall-5.2.8-r2::gentoo  USE="init ipv4 ipv6 -doc -lite4 -lite6 (-selinux)" 878 KiB

Total: 1 package (1 new), Size of downloads: 878 KiB