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

Calculating dependencies ... done!
Dependency resolution took 1.04 s (backtrack: 0/20).

[ebuild  N     ] acct-group/memcached-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/memcached-0-r3::gentoo  0 KiB
[ebuild  N     ] net-misc/memcached-1.6.45::gentoo  USE="seccomp ssl -debug -sasl (-selinux) -slabs-reassign -test" 1243 KiB
[ebuild  N     ] dev-libs/libmemcached-1.0.18-r4::gentoo  USE="libevent -debug -hsieh -sasl" 1016 KiB

Total: 4 packages (4 new), Size of downloads: 2259 KiB