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-2.69-r2:2.69::gentoo  USE="-verify-sig" 1438 KiB
[ebuild  N     ] dev-build/automake-vanilla-1.15.1-r1:1.15::gentoo  USE="-test" 1475 KiB

Total: 2 packages (2 new), Size of downloads: 2912 KiB