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

Calculating dependencies ... done!
Dependency resolution took 1.10 s (backtrack: 0/20).

[ebuild  N     ] dev-tcltk/tdom-0.9.6::gentoo  USE="threads -test" 1495 KiB
[ebuild  N     ] dev-lang/tk-8.6.17:0/8.6::gentoo  USE="threads truetype (-aqua) -debug -test -xscreensaver" 4486 KiB
[ebuild  N     ] dev-tcltk/tcllib-2.0::gentoo  USE="-examples -test" 14524 KiB
[ebuild  N     ] dev-tcltk/tklib-0.9::gentoo  USE="-doc" 6996 KiB

Total: 4 packages (4 new), Size of downloads: 27500 KiB