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

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] sci-libs/gsl-2.7.1-r3:0/27::gentoo  USE="deprecated -cblas-external -static-libs" 7346 KiB
[ebuild  N     ] dev-lang/algol68g-3.13.3::gentoo  USE="curl gsl mpfr ncurses readline -plotutils -postgres" 679 KiB

Total: 2 packages (2 new), Size of downloads: 8024 KiB