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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] acct-group/tss-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/tss-0-r3::gentoo  0 KiB
[ebuild  N     ] app-crypt/trousers-0.3.15-r1::gentoo  USE="-doc (-selinux)" 4590 KiB

Total: 3 packages (3 new), Size of downloads: 4590 KiB