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

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

[ebuild  N     ] dev-libs/pugixml-1.16::gentoo  USE="-test" 575 KiB
[ebuild  N     ] net-libs/libnet-1.3-r1:1.1::gentoo  USE="-man -static-libs -test" 603 KiB
[ebuild  N     ] net-misc/sipp-3.8.0::gentoo  USE="pcap -gsl -sctp -test" 2176 KiB

Total: 3 packages (3 new), Size of downloads: 3354 KiB