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

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

[ebuild  N     ] app-text/mecab-0.996-r2::gentoo  USE="unicode -static-libs" 1366 KiB
[ebuild  N     ] app-dicts/mecab-ipadic-2.7.0.20070801-r1::gentoo  USE="unicode" 11922 KiB
[ebuild  N     ] dev-perl/mecab-perl-0.996-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 49 KiB

Total: 3 packages (3 new), Size of downloads: 13337 KiB