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

Calculating dependencies ... done!
Dependency resolution took 1.07 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/msgpack-7.0.1:0/2-c::gentoo  USE="-doc -examples -test" 69 KiB
[ebuild  N     ] sys-libs/libutempter-1.2.1::gentoo  USE="-static-libs" 18 KiB
[ebuild  N     ] net-libs/libssh-0.12.2:0/4::gentoo  USE="sftp zlib -debug -examples -fido2 -gssapi -mbedtls -pcap -server -static-libs -test -verify-sig" 742 KiB
[ebuild  N     ] app-misc/tmate-2.4.0-r2::gentoo  USE="-debug" 600 KiB

Total: 4 packages (4 new), Size of downloads: 1428 KiB