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-cpp/muParser-2.3.5:0/2.3::gentoo  USE="openmp -doc -test" 113 KiB
[ebuild  N     ] dev-libs/utfcpp-4.0.6::gentoo  USE="-test" 34 KiB
[ebuild  N     ] games-server/monopd-0.10.4::gentoo  USE="(-systemd)" 199 KiB

Total: 3 packages (3 new), Size of downloads: 345 KiB