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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] mail-filter/procmail-3.24-r1::gentoo  USE="-mbox (-selinux)" 293 KiB
[ebuild  N     ] virtual/mda-0::gentoo  0 KiB

Total: 2 packages (2 new), Size of downloads: 293 KiB