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-lang/gprolog-1.5.0-r1::gentoo  USE="-debug -doc -examples" 3725 KiB

Total: 1 package (1 new), Size of downloads: 3725 KiB