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-db/lmdb-0.9.36:0/0.9.36::gentoo  USE="-static-libs" 147 KiB
[ebuild  N     ] dev-db/lmdb++-1.0.0-r1::gentoo  USE="-test" 52 KiB

Total: 2 packages (2 new), Size of downloads: 198 KiB