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-doc/gnu-c-intro-ref-0.1::gentoo  USE="-pdf" 1520 KiB

Total: 1 package (1 new), Size of downloads: 1520 KiB