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/tree-3.18-r1::gentoo  USE="-doc" 1152 KiB
[ebuild  N     ] sci-libs/liborigin-3.0.1_p20210828-r1:2::gentoo  USE="-debug -doc -tools" 153 KiB

Total: 2 packages (2 new), Size of downloads: 1305 KiB