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

Calculating dependencies ... done!
Dependency resolution took 1.80 s (backtrack: 3/20).

[ebuild  N     ] dev-libs/libmaxminddb-1.14.1:0/0.0.7::gentoo  USE="-test" 827 KiB
[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild  N     ] acct-group/airdcppd-0-r3::gentoo  0 KiB
[ebuild  N     ] net-libs/miniupnpc-2.3.3-r1:0/21::gentoo  USE="-verify-sig" 138 KiB
[ebuild  N     ] dev-cpp/nlohmann_json-3.12.0-r1::gentoo  USE="-test" 9452 KiB
[ebuild  N     ] dev-libs/crc32c-1.1.2-r2::gentoo  USE="-test" 30 KiB
[ebuild  N     ] app-arch/snappy-1.2.2-r1:0/1.1::gentoo  USE="-test" CPU_FLAGS_X86="avx avx2" 1083 KiB
[ebuild  N     ] dev-libs/boost-1.91.0-r2:0/1.91.0::gentoo  USE="bzip2 context nls python stacktrace zlib -debug -doc -icu -lzma -mpi -numpy -test -test-full -tools -zstd" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" 199785 KiB
[ebuild  N     ] acct-user/airdcppd-0-r3::gentoo  0 KiB
[ebuild  N     ] dev-libs/leveldb-1.23-r6:0/1::gentoo  USE="snappy tcmalloc -test" 238 KiB
[ebuild  N     ] x11-libs/libpciaccess-0.19::gentoo  USE="zlib -static-libs" 64 KiB
[ebuild  N     ] dev-cpp/websocketpp-0.8.2-r1::gentoo  USE="-examples -test" 702 KiB
[ebuild  N     ] sys-apps/hwloc-2.12.2:0/15::gentoo  USE="X cairo cpuid pci -cuda -debug -doc -l0 -nvml -rocm (-selinux) -static-libs -svg -udev -valgrind -xml" VIDEO_CARDS="-nvidia" 5504 KiB
[ebuild  N     ] dev-cpp/tbb-2023.1.0:0/12.2.3::gentoo  USE="-test" 7542 KiB
[ebuild  N     ] net-p2p/airdcpp-webclient-2.13.3::gentoo  USE="tbb webui -nat-pmp" 811 KiB
[ebuild  N     ] www-apps/airdcpp-webui-2.13.1::gentoo  8649 KiB

Total: 16 packages (16 new), Size of downloads: 236018 KiB

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

net-p2p/airdcpp-webclient:0

  (net-p2p/airdcpp-webclient-2.14.0:0/0::gentoo, ebuild scheduled for merge) USE="tbb webui -nat-pmp" conflicts with
    =net-p2p/airdcpp-webclient-2.13.3


!!! The following update(s) have been skipped due to unsatisfied dependencies
!!! triggered by backtracking:

www-apps/airdcpp-webui:0