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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-build/autoconf-vanilla-2.13-r1:2.1::gentoo  USE="-test" 434 KiB

Total: 1 package (1 new), Size of downloads: 434 KiB