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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/lzo-2.10:2::gentoo  USE="(split-usr) -examples -static-libs" 587 KiB
[ebuild  N     ] dev-libs/blake3-1.8.7::gentoo  USE="-test" 263 KiB
[ebuild  N     ] dev-util/xdelta-3.2.2:3::gentoo  USE="-examples -lzma -test" 221 KiB
[ebuild  N     ] dev-util/squashmerge-0.1::gentoo  USE="lzo -lz4" 75 KiB

Total: 4 packages (4 new), Size of downloads: 1145 KiB