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

Calculating dependencies ... done!
Dependency resolution took 1.51 s (backtrack: 0/20).

[ebuild     U  ] dev-libs/libevent-2.1.13:0/2.1-7::gentoo [2.1.12-r1:0/2.1-7::gentoo] USE="clock-gettime ssl -debug -malloc-replacement -static-libs -test -verbose-debug -verify-sig" 1101 KiB

Total: 1 package (1 upgrade), Size of downloads: 1101 KiB