anchor.diff:  
     src = fetchFromGitHub {
       owner = "aruiz";
  -    repo = pname;
  +    repo = "webp-pixbuf-loader";
       rev = version;
       sha256 = "sha256-dcdydWYrXZJjo4FxJtvzGzrQLOs87/BmxshFZwsT2ws=";
     };
   
  -  # It looks for gdk-pixbuf-thumbnailer in this package's bin rather than the gdk-pixbuf bin. We need to patch that.
  -  postPatch = ''
  -    substituteInPlace webp-pixbuf.thumbnailer.in --replace @bindir@/gdk-pixbuf-thumbnailer $out/bin/webp-thumbnailer
  -  '';
  +  nativeBuildInputs = [
  +    gdk-pixbuf
  +    meson
  +    ninja
  +    pkg-config
  +    makeWrapper
  +  ];
   
  -  nativeBuildInputs = [ gdk-pixbuf meson ninja pkg-config makeWrapper ];
  -  buildInputs = [ gdk-pixbuf libwebp ];
  +  buildInputs = [
  +    gdk-pixbuf
  +    libwebp
  +  ];
   
     mesonFlags = [
       "-Dgdk_pixbuf_query_loaders_path=${gdk-pixbuf.dev}/bin/gdk-pixbuf-query-loaders"
       "-Dgdk_pixbuf_moduledir=${placeholder "out"}/${moduleDir}"
     ];
   
  -  # It assumes gdk-pixbuf-thumbnailer can find the webp loader in the loaders.cache referenced by environment variable, breaking containment.
  -  # So we replace it with a wrapped executable.
  -  postInstall = ''
  -    mkdir -p $out/bin
  -    makeWrapper ${gdk-pixbuf}/bin/gdk-pixbuf-thumbnailer $out/bin/webp-thumbnailer \
  -      --set GDK_PIXBUF_MODULE_FILE $out/${loadersPath}
  +  postPatch = ''
  +    # It looks for gdk-pixbuf-thumbnailer in this package's bin rather than the gdk-pixbuf bin. We need to patch that.
  +    substituteInPlace webp-pixbuf.thumbnailer.in \
  +      --replace "@bindir@/gdk-pixbuf-thumbnailer" "$out/bin/webp-thumbnailer"
     '';
   
  -  # environment variables controlling loaders.cache generation by gdk-pixbuf-query-loaders
     preInstall = ''
  -    export GDK_PIXBUF_MODULE_FILE=$out/${loadersPath}
  -    export GDK_PIXBUF_MODULEDIR=$out/${moduleDir}
  +    # environment variables controlling loaders.cache generation by gdk-pixbuf-query-loaders
  +    export GDK_PIXBUF_MODULE_FILE="$out/${loadersPath}"
  +    export GDK_PIXBUF_MODULEDIR="$out/${moduleDir}"
  +  '';
  +
  +  postInstall = ''
  +    # It assumes gdk-pixbuf-thumbnailer can find the webp loader in the loaders.cache referenced by environment variable, breaking containment.
  +    # So we replace it with a wrapped executable.
  +    mkdir -p "$out/bin"
  +    makeWrapper "${gdk-pixbuf}/bin/gdk-pixbuf-thumbnailer" "$out/bin/webp-thumbnailer" \
  +      --set GDK_PIXBUF_MODULE_FILE "$out/${loadersPath}"
     '';
   
     meta = with lib; {
  
positive.code: { lib, stdenv, fetchFromGitHub
  , meson, ninja, pkg-config, makeWrapper
  , gdk-pixbuf, libwebp
  }:
  let
    moduleDir = gdk-pixbuf.moduleDir;
  
    # turning lib/gdk-pixbuf-#.#/#.#.#/loaders into lib/gdk-pixbuf-#.#/#.#.#/loaders.cache
    # removeSuffix is just in case moduleDir gets a trailing slash
  
negative.code:     homepage = "https://github.com/aruiz/webp-pixbuf-loader";
      license = licenses.lgpl2Plus;
      platforms = platforms.unix;
      maintainers = teams.gnome.members ++ [ maintainers.cwyc ];
      # meson.build:16:0: ERROR: Program or command 'gcc' not found or not executable
      broken = stdenv.isDarwin;
    };
  