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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild   R    ] dev-libs/jsoncpp-1.9.6-r2:0/26::gentoo  USE="-doc -test" 208 KiB

Total: 1 package (1 reinstall), Size of downloads: 208 KiB