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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/argtable-2.13-r4::gentoo  USE="-debug -doc -examples -static-libs" 3249 KiB
[ebuild  N     ] dev-cpp/libjson-rpc-cpp-1.4.0-r1:0/1::gentoo  USE="http-client http-server stubgen -redis-client -redis-server -test" 176 KiB

Total: 2 packages (2 new), Size of downloads: 3424 KiB