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

Calculating dependencies ... done!
Dependency resolution took 1.52 s (backtrack: 0/20).

[ebuild     U  ] dev-build/autoconf-2.72-r7:2.72::gentoo [2.72-r6:2.72::gentoo] USE="-verify-sig" 1358 KiB

Total: 1 package (1 upgrade), Size of downloads: 1358 KiB