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

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

[ebuild  N     ] dev-libs/libmodbus-3.1.12::gentoo  USE="-static-libs -test" 473 KiB

Total: 1 package (1 new), Size of downloads: 473 KiB