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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libpng-compat-1.5.30-r1:1.5::gentoo  740 KiB

Total: 1 package (1 new), Size of downloads: 740 KiB