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

Calculating dependencies ... done!
Dependency resolution took 1.08 s (backtrack: 0/20).

[ebuild  N     ] net-libs/mbedtls-2.28.10:0/7.14.1::gentoo  USE="threads -cmac -doc -havege -programs -static-libs -test -zlib" CPU_FLAGS_X86="sse2" 3408 KiB
[ebuild  N     ] dev-db/qdbm-1.8.78-r5::gentoo  USE="bzip2 zlib -cxx -java -lzo -perl -ruby -static-libs" RUBY_TARGETS="ruby32 ruby33" 992 KiB
[ebuild  N     ] dev-scheme/gauche-0.9.15-r1:0/0.98::gentoo  USE="ipv6 -test" 9224 KiB
[ebuild  N     ] dev-scheme/gauche-qdbm-0.2-r1::gentoo  72 KiB

Total: 4 packages (4 new), Size of downloads: 13695 KiB