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

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

[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/blt-2.5.3-r4:0/25::gentoo  USE="jpeg -static-libs" 2712 KiB

Total: 2 packages (2 new), Size of downloads: 7197 KiB