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-libs/libkdumpfile-0.5.6:0/1::gentoo  USE="zlib -lzo -snappy -zstd" 616 KiB

Total: 1 package (1 new), Size of downloads: 616 KiB