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

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

[ebuild  N     ] net-libs/udns-0.6::gentoo  USE="ipv6 tools" 84 KiB
[ebuild  N     ] net-libs/libtorrent-0.15.7::gentoo  USE="-debug -test" 852 KiB

Total: 2 packages (2 new), Size of downloads: 936 KiB