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

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

[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/libvpl-2.17.0:0/2::gentoo  USE="-examples -test" 12671 KiB
[ebuild  N     ] media-libs/libva-2.24.1:0/2::gentoo  USE="X -glx -wayland" 300 KiB
[ebuild  N     ] media-libs/libvpl-tools-1.6.0::gentoo  USE="X drm vaapi -dri -opencl -test -wayland" 1278 KiB

Total: 5 packages (1 upgrade, 4 new), Size of downloads: 14738 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/libvpl-tools-1.6.0::gentoo[drm]
# required by =media-libs/libvpl-tools-1.6.0 (argument)
>=x11-libs/libdrm-2.4.134 video_cards_intel