mesa: have one attribute per major version

  # Default libGLU

  libGLU = mesa_glu;

  # When a new patch is out, add a new mesa attribute with the exact patch version

  # Remove old mesa attributes when they're unused.

  # Try to keep the previous version around for a bit in case there are new bugs.

  mesa_22_3_7 = darwin.apple_sdk_11_0.callPackage ../development/libraries/mesa/22.3.7.nix {

  # Keep Mesa 22.3 for now because 23.0 does not build on Darwin.

  # FIXME: remove, also investigate why we even need Mesa on Darwin.

  mesa_22_3 = darwin.apple_sdk_11_0.callPackage ../development/libraries/mesa/22.3.nix {

    inherit (darwin.apple_sdk_11_0.frameworks) OpenGL;

    inherit (darwin.apple_sdk_11_0.libs) Xplugin;

  };

  mesa_23_0_1 = darwin.apple_sdk_11_0.callPackage ../development/libraries/mesa/23.0.1.nix {

  mesa_23_0 = darwin.apple_sdk_11_0.callPackage ../development/libraries/mesa/23.0.nix {

    inherit (darwin.apple_sdk_11_0.frameworks) OpenGL;

    inherit (darwin.apple_sdk_11_0.libs) Xplugin;

  };

  # Bump this immediately on patches; wait a bit for minor versions

  mesa_22 = mesa_22_3_7;

  mesa_23 = mesa_23_0_1;

  # Bump on staging only, tonnes of packages depend on it.

  # See https://github.com/NixOS/nixpkgs/issues/218232

  # Major versions should be bumped when they have proven to be reasonably stable

  # FIXME: split up libgbm properly

  # darwin: deferred until stabilized; e.g. see around:

  #   https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21859

  mesa = if stdenv.isDarwin then mesa_22_3_7 else mesa_23_0_1;

  mesa = if stdenv.isDarwin then mesa_22_3 else mesa_23_0;

  mesa_glu =  callPackage ../development/libraries/mesa-glu {

    inherit (darwin.apple_sdk.frameworks) ApplicationServices;