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

Calculating dependencies ... done!
Dependency resolution took 0.95 s (backtrack: 0/20).

[ebuild  N     ] net-misc/iperf-2.2.1:2::gentoo  USE="-debug" 498 KiB

Total: 1 package (1 new), Size of downloads: 498 KiB