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

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] acct-group/stunnel-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/stunnel-0-r3::gentoo  0 KiB
[ebuild  N     ] net-misc/stunnel-5.75::gentoo  USE="ssl (-selinux) -stunnel3 (-systemd) -tcpd -test" 900 KiB

Total: 3 packages (3 new), Size of downloads: 900 KiB