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

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

[ebuild  N     ] dev-util/cppunit-1.15.1_p20240106:0/1.15::gentoo  USE="-doc -examples" 813 KiB
[ebuild  N     ] dev-libs/dbus-c++-0.9.0-r5::gentoo  USE="-doc -ecore -glib -test" 456 KiB

Total: 2 packages (2 new), Size of downloads: 1268 KiB