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

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

[ebuild  N     ] acct-group/ftp-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/root-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/ftp-0-r5::gentoo  0 KiB
[ebuild  N     ] net-ftp/ftpbase-0.01-r6::gentoo  USE="pam zeroconf" 0 KiB
[ebuild  N     ] net-ftp/vsftpd-3.0.5-r2::gentoo  USE="pam ssl (-selinux) -tcpd -verify-sig" 194 KiB

Total: 5 packages (5 new), Size of downloads: 194 KiB