Describe the bug

In (yet to be released) Mesa 24.2, LIBGL_DRIVERS_PATH is dropped in favor of making all the GL frontends link directly to the Gallium backend driver.

See Mesa 24.2 Enjoyed Some Last Minute Code Cleaning & Modernization
And glx/egl/gbm: link directly to gallium

We have a few in tree references to LIBGL_DRIVERS_PATH that should be removed/replaced:

• plex-desktop:
  

  nixpkgs/pkgs/by-name/pl/plex-desktop/package.nix

  Line 146 in 1d3f999

  LIBGL_DRIVERS_PATH=$PLEX_USR_PATH/dri

• llvmpipe-hook:
  

  nixpkgs/pkgs/development/libraries/mesa/llvmpipe-hook.sh

  Line 5 in 1d3f999

  export LIBGL_DRIVERS_PATH=@drivers@/lib/dri

• nixosTests.turbovnc-headless-server:
  

  nixpkgs/nixos/tests/turbovnc-headless-server.nix

  Line 125 in 1d3f999

  "(env DISPLAY=:0 LIBGL_DRIVERS_PATH=/nonexistent glxgears -info | tee /tmp/glxgears-should-fail.stdout) 3>&1 1>&2 2>&3 | tee /tmp/glxgears-should-fail.stderr >&2 &"

  • Fixed in turbovnc: 3.1.4 -> 3.2 #410000

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