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

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] dev-games/guichan-0.8.2-r1::gentoo  USE="opengl -allegro -sdl" 562 KiB

Total: 1 package (1 new), Size of downloads: 562 KiB