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

Calculating dependencies ... done!
Dependency resolution took 1.34 s (backtrack: 0/20).

[ebuild  N     ] acct-group/postgres-0-r3::gentoo  0 KiB
[ebuild  N     ] app-eselect/eselect-postgresql-2.4-r1::gentoo  5 KiB
[ebuild  N     ] app-arch/lz4-1.10.0-r1:0/1.10.0-meson::gentoo  USE="-static-libs -test" 379 KiB
[ebuild  N     ] sys-process/numactl-2.0.19::gentoo  USE="-static-libs" 441 KiB
[ebuild  N     ] sys-libs/liburing-2.15:0/2::gentoo  USE="-examples -static-libs -test" 538 KiB
[ebuild  N     ] app-text/docbook-sgml-dtd-4.5-r2:4.5::gentoo  70 KiB
[ebuild  N     ] app-text/docbook-sgml-dtd-3.0-r5:3.0::gentoo  43 KiB
[ebuild  N     ] dev-libs/hiredis-1.4.1:0/1.4::gentoo  USE="ssl -examples -static-libs -test" 172 KiB
[ebuild  N     ] dev-libs/cJSON-1.7.19::gentoo  USE="-test" 348 KiB
[ebuild  N     ] net-libs/libnet-1.3-r1:1.1::gentoo  USE="-man -static-libs -test" 603 KiB
[ebuild  N     ] net-libs/paho-mqtt-c-1.3.16:1.3::gentoo  USE="high-performance ssl -doc -examples -test" 1316 KiB
[ebuild  N     ] acct-group/gvm-0-r3::gentoo  0 KiB
[ebuild  N     ] dev-libs/libical-3.0.20-r2:0/3::gentoo  USE="glib -doc -examples -introspection -static-libs -test -vala" 952 KiB
[ebuild  N     ] acct-user/postgres-0-r3::gentoo  0 KiB
[ebuild  N     ] app-text/docbook-dsssl-stylesheets-1.79-r4::gentoo  272 KiB
[ebuild  N     ] acct-user/gvm-0-r3::gentoo  0 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     ] net-analyzer/gvm-libs-22.35.4::gentoo  USE="-doc -ldap -radius -test" 418 KiB
[ebuild  N     ] dev-db/postgresql-18.6:18::gentoo  USE="icu lz4 nls numa pam python readline server ssl uring uuid zlib zstd -debug -doc -kerberos -ldap -llvm -oauth -perl (-selinux) -static-libs (-systemd) -tcl -xml" LLVM_SLOT="22 -17 -18 -19 -20 -21 -23" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13" 22102 KiB
[ebuild  N     ] dev-db/pg-gvm-22.6.14::gentoo  40 KiB

Total: 20 packages (20 new), Size of downloads: 28432 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by dev-db/pg-gvm-22.6.14::gentoo
# required by =dev-db/pg-gvm-22.6.14 (argument)
>=dev-db/postgresql-18.6 uuid