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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] app-eselect/eselect-mpg123-0.1-r1::gentoo  0 KiB
[ebuild  N     ] media-sound/mpg123-base-1.33.3::gentoo  USE="alsa ipv6 (-coreaudio) -int-quality -jack -nas -oss -portaudio -pulseaudio -sdl" CPU_FLAGS_X86="sse (-3dnow) (-3dnowext) (-mmx)" 1096 KiB

Total: 2 packages (2 new), Size of downloads: 1096 KiB