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

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

[ebuild  N     ] net-mail/mpop-1.4.21::gentoo  USE="nls ssl -gnutls -idn -keyring -sasl" 396 KiB

Total: 1 package (1 new), Size of downloads: 396 KiB