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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] app-crypt/johntheripper-1.8.0-r2::gentoo  USE="openmp -custom-cflags" CPU_FLAGS_X86="avx sse2 (-mmx) -xop" 4364 KiB

Total: 1 package (1 new), Size of downloads: 4364 KiB