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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] media-gfx/pngcrush-1.8.13::gentoo  65 KiB
[ebuild  N     ] app-doc/selflinux-0.13.0-r1::gentoo  7207 KiB

Total: 2 packages (2 new), Size of downloads: 7272 KiB