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

Calculating dependencies  ... done!
Dependency resolution took 4.41 s (backtrack: 0/20).

[ebuild   R    ] media-libs/mesa-25.3.6::gentoo  USE="X (opengl) proprietary-codecs vaapi zstd -debug -llvm -lm-sensors -opencl -sysprof -test -unwind -valgrind -vulkan -wayland" ABI_X86="(64) -32 (-x32)" CPU_FLAGS_X86="sse2" LLVM_SLOT="21 -18 -19 -20" VIDEO_CARDS="nouveau -asahi -d3d12 (-freedreno) -i915 (-imagination) -intel -lavapipe (-lima) -nvk (-panfrost) -r300 -r600 -radeon -radeonsi (-v3d) (-vc4) -virgl (-vivante) -vmware -zink" 0 KiB
[ebuild   R    ] x11-libs/libvdpau-1.5::gentoo  USE="dri -doc -test" ABI_X86="(64) -32 (-x32)" 0 KiB
[ebuild   R    ] x11-base/xorg-server-21.1.21:0/21.1.21::gentoo  USE="elogind udev xorg -debug -minimal (-selinux) -suid -systemd -test -unwind -xcsecurity -xephyr -xnest -xvfb" 0 KiB

Total: 3 packages (3 reinstalls), Size of downloads: 0 KiB