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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] virtual/fortran-0-r1::gentoo  USE="openmp" 0 KiB
[ebuild  N     ] sci-physics/looptools-2.15-r1:0/2.15::gentoo  USE="-doc" 540 KiB

Total: 2 packages (2 new), Size of downloads: 540 KiB