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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] sci-libs/alglib-3.20.0:0/3.20::gentoo  USE="-test" 3248 KiB

Total: 1 package (1 new), Size of downloads: 3248 KiB