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-biology/fasttree-2.1.11::gentoo  USE="openmp -double-precision" CPU_FLAGS_X86="sse3" 493 KiB

Total: 1 package (1 new), Size of downloads: 493 KiB