genr8too ~ # emerge -avuDN @world

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

Calculating dependencies  ........ .... done!
Dependency resolution took 68.51 s (backtrack: 6/20).

[ebuild  rR   ~] sys-apps/usbguard-1.1.2:0/1::gentoo  USE="(selinux) -dbus -ldap -policykit -static-libs -systemd -test -umockdev" 1,656 KiB
[ebuild     U  ] net-im/gajim-1.8.1::gentoo [1.7.3-r1::gentoo] USE="crypt webp -geolocation -jingle -remote -rst -spell -upnp (-omemo%)" PYTHON_SINGLE_TARGET="python3_11 -python3_10" 3,755 KiB
[ebuild  N     ]  dev-python/omemo-dr-1.0.1::gentoo  USE="-debug -test" PYTHON_TARGETS="python3_11 -python3_10 (-python3_12)" 149 KiB
[ebuild  N     ]  dev-python/python-axolotl-0.2.3-r3::gentoo  USE="-test" PYTHON_TARGETS="python3_11 -python3_10 (-python3_12)" 51 KiB
[ebuild  N    ~]   dev-python/protobuf-python-4.23.3:0/23.3.0::gentoo  USE="-debug -test" PYTHON_TARGETS="python3_11 -python3_10 -python3_12" 4,926 KiB
[ebuild  r  U ~]    dev-libs/protobuf-23.3-r2:0/23.3.0::gentoo [21.12:0/3.21.12.0::gentoo] USE="zlib -emacs -examples -test" 0 KiB
[ebuild  N    ~]     dev-cpp/abseil-cpp-20230802.0:0/20230802::gentoo  USE="-test" 2,107 KiB
[ebuild  N     ]  dev-python/qrcode-7.4.2::gentoo  USE="-test" PYTHON_TARGETS="python3_11 (-pypy3) -python3_10 (-python3_12)" 524 KiB
[nomerge       ] dev-python/python-axolotl-0.2.3-r3::gentoo  USE="-test" PYTHON_TARGETS="python3_11 -python3_10 (-python3_12)" 
[ebuild  N     ]  dev-python/python-axolotl-curve25519-0.4.1_p2-r4::gentoo  USE="-debug" PYTHON_TARGETS="python3_11 -python3_10 (-python3_12)" 99 KiB
[nomerge       ] dev-python/qrcode-7.4.2::gentoo  USE="-test" PYTHON_TARGETS="python3_11 (-pypy3) -python3_10 (-python3_12)" 
[ebuild  N     ]  dev-python/pypng-0.20220715.0::gentoo  PYTHON_TARGETS="python3_11 (-pypy3) -python3_10 (-python3_12)" 102 KiB

Total: 10 packages (2 upgrades, 7 new, 1 reinstall), Size of downloads: 13,366 KiB

WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict:

dev-cpp/catch:0

  (dev-cpp/catch-3.4.0:0/0::gentoo, ebuild scheduled for merge) USE="-test" conflicts with
    <dev-cpp/catch-3:0 required by (sys-apps/usbguard-1.1.2:0/1::gentoo, ebuild scheduled for merge) USE="(selinux) -dbus -ldap -policykit -static-libs -systemd -test -umockdev"
    ^              ^  

sys-firmware/ipxe:0

  (sys-firmware/ipxe-1.21.1_p20230601:0/0::gentoo, ebuild scheduled for merge) USE="binary qemu secureboot uefi64 usb -ipv6 -iso -lkrn -savedconfig -uefi32 -undi -vmware" conflicts with
    ~sys-firmware/ipxe-1.21.1[binary,qemu] required by (app-emulation/qemu-8.1.5-1:0/0::gentoo, installed) USE="aio alsa bzip2 curl fdt filecaps fuse gnutls gtk io-uring jack jpeg ncurses opengl oss pam pin-upstream-blobs png sdl sdl-image seccomp (selinux) slirp snappy spice ssh usb usbredir vhost-net virgl virtfs vnc vte xattr zstd -accessibility -bpf (-capstone) -debug -doc -glusterfs -infiniband -iscsi -jemalloc -keyutils -lzo -multipath -nfs -nls -numa -pipewire -plugins -pulseaudio -python -rbd -sasl -smartcard -static-user -systemtap -test -udev -vde -xen" PYTHON_TARGETS="python3_11 -python3_10 (-python3_12)" QEMU_SOFTMMU_TARGETS="ppc ppc64 x86_64 -aarch64 -alpha -arm -avr -cris -hppa -i386 -loongarch64 -m68k -microblaze -microblazeel -mips -mips64 -mips64el -mipsel -nios2 -or1k -riscv32 -riscv64 -rx -s390x -sh4 -sh4eb -sparc -sparc64 -tricore -xtensa -xtensaeb" QEMU_USER_TARGETS="-aarch64 -aarch64_be -alpha -arm -armeb -cris -hexagon -hppa -i386 -loongarch64 -m68k -microblaze -microblazeel -mips -mips64 -mips64el -mipsel -mipsn32 -mipsn32el -nios2 -or1k -ppc -ppc64 -ppc64le -riscv32 -riscv64 -s390x -sh4 -sh4eb -sparc -sparc32plus -sparc64 -x86_64 -xtensa -xtensaeb"
    ^                  ^^^^^^             

app-containers/runc:0

  (app-containers/runc-1.1.9:0/0::gentoo, ebuild scheduled for merge) USE="hardened kmem seccomp (selinux) -apparmor -test" conflicts with
    ~app-containers/runc-1.1.7[seccomp] required by (app-containers/containerd-1.7.1-r1-2:0/0::gentoo, installed) USE="cri hardened seccomp (selinux) -apparmor -btrfs -device-mapper -test"
    ^                    ^^^^^         

dev-libs/openssl:0

  (dev-libs/openssl-3.0.12:0/3::gentoo, ebuild scheduled for merge) USE="asm verify-sig -fips -ktls -rfc3779 -sctp -static-libs -test -tls-compression -vanilla -weak-ssl-ciphers" CPU_FLAGS_X86="(sse2)" conflicts with
    <dev-libs/openssl-3.0.12 required by (dev-libs/libp11-0.4.12-r6-1:0/0::gentoo, installed) USE="-doc -static-libs -test"
    ^                 ^^^^^^

sys-kernel/installkernel:0

  (sys-kernel/installkernel-24:0/0::gentoo, ebuild scheduled for merge) USE="-dracut -grub -systemd -systemd-boot -uki -ukify" conflicts with
    >=sys-kernel/installkernel-8[dracut(-)] required by (sys-kernel/gentoo-kernel-bin-6.1.69-1:6.1.69/6.1.69::gentoo, installed) USE="initramfs -test"
                                           


The following packages are causing rebuilds:

  (dev-libs/protobuf-23.3-r2:0/23.3.0::gentoo, ebuild scheduled for merge) causes rebuilds for:
    (sys-apps/usbguard-1.1.2:0/1::gentoo, ebuild scheduled for merge)

The following keyword changes are necessary to proceed:
 (see "package.accept_keywords" in the portage(5) man page for more details)
# required by dev-python/omemo-dr-1.0.1::gentoo
# required by net-im/gajim-1.8.1::gentoo[python_single_target_python3_11]
# required by @selected
# required by @world (argument)
=dev-python/protobuf-python-4.23.3 ~amd64
# required by dev-libs/protobuf-23.3-r2::gentoo
# required by dev-python/protobuf-python-4.23.3::gentoo
# required by dev-python/python-axolotl-0.2.3-r3::gentoo
# required by net-im/gajim-1.8.1::gentoo[python_single_target_python3_11]
# required by @selected
# required by @world (argument)
=dev-cpp/abseil-cpp-20230802.0 ~amd64
# required by @__auto_slot_operator_replace_installed__ (argument)
=dev-libs/protobuf-23.3-r2 ~amd64