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/mrbayes-3.1.2-r2::gentoo  USE="readline -debug -mpi" 534 KiB

Total: 1 package (1 new), Size of downloads: 534 KiB