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-libs/libupnp-1.18.5:0/20::gentoo  USE="reuseaddr ssl -blocking-tcp -debug -doc -samples -static-libs" 815 KiB

Total: 1 package (1 new), Size of downloads: 815 KiB