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

Calculating dependencies ... done!
Dependency resolution took 1.61 s (backtrack: 0/20).

[ebuild  N     ] dev-util/wayland-scanner-1.26.0::gentoo  599 KiB
[ebuild  N     ] x11-libs/libpciaccess-0.19::gentoo  USE="zlib -static-libs" 64 KiB
[ebuild     U  ] x11-libs/libdrm-2.4.134::gentoo [2.4.131::gentoo] USE="-doc -test -tools -udev -valgrind" VIDEO_CARDS="intel* vmware -amdgpu (-exynos) (-freedreno) -nouveau (-omap) -radeon (-tegra) (-vc4) (-vivante)" 427 KiB
[ebuild  N     ] media-libs/libva-2.24.1:0/2::gentoo  USE="X -glx -wayland" 300 KiB
[ebuild  N     ] media-libs/libva-intel-driver-2.4.5::gentoo  USE="X -hybrid -wayland" 3855 KiB

Total: 5 packages (1 upgrade, 4 new), Size of downloads: 5242 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by media-libs/libva-intel-driver-2.4.5::gentoo
# required by =media-libs/libva-intel-driver-2.4.5 (argument)
>=x11-libs/libdrm-2.4.134 video_cards_intel