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

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libopenaptx-0.2.0-r1::gentoo  CPU_FLAGS_X86="avx2" 28 KiB

Total: 1 package (1 new), Size of downloads: 28 KiB