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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libconfig-1.8.2:0/15::gentoo  USE="cxx -debug -static-libs -test" 3262 KiB
[ebuild  N     ] net-misc/sslh-2.3.0::gentoo  USE="-caps -libev (-systemd) -tcpd" 521 KiB

Total: 2 packages (2 new), Size of downloads: 3782 KiB