{ ... }:

final: prev:
let
  mesaLibdrm = prev.libdrm.overrideAttrs (old: rec {
    version = "2.4.133";
    src = prev.fetchurl {
      url = "https://dri.freedesktop.org/libdrm/libdrm-2.4.133.tar.xz";
      sha256 = "sha256-/Gj50LoupjyUMqKZ4U/qCfrXqKZugDn814AspZ93tPU=";
    };
  });
in
{
  mesa = (prev.mesa.override { libdrm = mesaLibdrm; }).overrideAttrs (old: rec {
    version = "git-unstable-2026-05-07";
    src = prev.fetchFromGitLab {
      domain = "gitlab.freedesktop.org";
      owner = "mesa";
      repo = "mesa";
      rev = "0f75fa5bfd29770128a412f1fcf5c4121f95e1bb";
      hash = "sha256-9sqgro3Y+yctcueHEO0hNmySLNn9F1HP3lPqcIow0+k=";
    };
    patches = [];
    buildInputs = old.buildInputs ++ (with prev.llvmPackages_21; [ 
      clang-unwrapped
      libclang
    ]);
    
    # Create symlinks to clang libraries so meson can find them
    preConfigure = (old.preConfigure or "") + ''
      mkdir -p $NIX_BUILD_TOP/clang-libs
      for lib in ${prev.llvmPackages_21.clang-unwrapped.lib}/lib/*.a; do
        ln -sf "$lib" "$NIX_BUILD_TOP/clang-libs/"
      done
      export LIBRARY_PATH="$NIX_BUILD_TOP/clang-libs:''${LIBRARY_PATH:-}"
      export CXXFLAGS="$CXXFLAGS -fno-strict-aliasing"
    '';
    
    mesonFlags = 
      (builtins.filter (flag: 
        !(prev.lib.hasPrefix "-Dclang-libdir=" flag) &&
        flag != "--sysconfdir=/etc"
      ) old.mesonFlags) ++ [
      "-Dsysconfdir=${placeholder "out"}/etc"
    ] ++ (if prev.stdenv.hostPlatform.is64bit then [ "-Dintel-rt=enabled" ] else [ "-Dintel-rt=disabled" ]);
  });
}