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

Calculating dependencies ... done!
Dependency resolution took 1.11 s (backtrack: 0/20).

[ebuild  N     ] dev-cpp/abseil-cpp-20260107.1:0/2601.1.0-cpp20::gentoo  USE="-debug -test -test-helpers" 2251 KiB
[ebuild  N     ] sci-libs/cddlib-094n::gentoo  USE="-doc -examples -static-libs -tools" 1349 KiB
[ebuild  N     ] x11-libs/libpciaccess-0.19::gentoo  USE="zlib -static-libs" 64 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     ] sci-mathematics/gfan-0.8_beta1::gentoo  USE="-doc" 1440 KiB

Total: 6 packages (6 new), Size of downloads: 18149 KiB