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

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] app-arch/sharutils-4.15.2-r3::gentoo  USE="nls" 1097 KiB
[ebuild  N     ] sci-libs/libpdb++-040728-r2::gentoo  USE="-static-libs" 111 KiB
[ebuild  N     ] sci-chemistry/ksdssp-040728-r1::gentoo  102 KiB

Total: 3 packages (3 new), Size of downloads: 1309 KiB