>>> Emerging : portage://x11-apps/igt-gpu-tools-2.3:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ useflag portage://x11-apps/igt-gpu-tools-2.3 (video_cards_nouveau)
             │ useflag portage://x11-libs/libdrm-2.4.134 (video_cards_nouveau)

 └─step  2─┤ download  portage://x11-apps/igt-gpu-tools-2.3
             │           └─ file ─┤ 3.23 Mb  	 igt-gpu-tools-2.3.tar.xz
             │ download  portage://x11-libs/libdrm-2.4.134
             │           └─ file ─┤ 427.00 Kb  	 libdrm-2.4.134.tar.xz
             │ download  portage://x11-libs/libpciaccess-0.19
             │           └─ file ─┤ 63.21 Kb  	 libpciaccess-0.19.tar.xz

 └─step  3─┤ install   portage://x11-libs/libpciaccess-0.19
             │           └─ conf ─┤ USE = "zlib -static-libs"
             │ update    portage://x11-libs/libdrm-2.4.134 (USE modified)
             │           └─ conf ─┤ USE = "-doc -test -tools -udev -valgrind"
             │                    │ VIDEO_CARDS = "vmware -amdgpu -intel nouveau -radeon"

 └─step  4─┤ run       portage://x11-libs/libpciaccess-0.19

 └─step  5─┤ install   portage://x11-apps/igt-gpu-tools-2.3 (USE modified)
             │           └─ conf ─┤ USE = "X* -chamelium -man -overlay -runner -tests -unwind -valgrind -xv"
             │                    │ VIDEO_CARDS = "-amdgpu -intel nouveau"

 └─step  6─┤ run     portage://x11-apps/igt-gpu-tools-2.3

Total: 10 actions (2 useflags, 3 downloads, 2 installs, 1 update, 2 runs), grouped into 6 steps.
       3.71 Mb to be downloaded.


>>> Assumptions taken during proving & planning:

  USE flag change (2 packages):
  Add to /etc/portage/package.use:
    x11-apps/igt-gpu-tools video_cards_nouveau
    x11-libs/libdrm video_cards_nouveau