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

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

[ebuild  N     ] net-fs/s3backer-2.1.6::gentoo  USE="-nbd" 157 KiB

Total: 1 package (1 new), Size of downloads: 157 KiB