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/libutf8proc-2.12.0:0/2.12.0::gentoo  USE="-cjk -static-libs -test" 200 KiB
[ebuild  N     ] dev-libs/poco-1.15.0:0/120::gentoo  USE="avahi crypt data mongodb net pagecompiler sqlite util xml zip -7z -activerecord -cppparser -examples -iodbc -mariadb -mysql -odbc -pdf -pocodoc -postgres -prometheus -test" 10952 KiB

Total: 2 packages (2 new), Size of downloads: 11152 KiB