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-cpp/muParser-2.3.4-r1::gentoo  USE="openmp -doc -test" 111 KiB

Total: 1 package (1 new), Size of downloads: 111 KiB