anchor.diff:      substituteInPlace tests/meson.build --subst-var-by installedtestsprefix "$installedTests"
     '';
   
  +  preInstall = ''
  +    PATH=$PATH:$out/bin # for install script
  +  '';
  +
     postInstall =
  -    # meson erroneously installs loaders with .dylib extension on Darwin.
  -    # Their @rpath has to be replaced before gdk-pixbuf-query-loaders looks at them.
  -    lib.optionalString stdenv.isDarwin ''
  +    ''
  +      # All except one utility seem to be only useful during building.
  +      moveToOutput "bin" "$dev"
  +      moveToOutput "bin/gdk-pixbuf-thumbnailer" "$out"
  +
  +      # So that devhelp can find this.
  +      mkdir -p "$devdoc/share/devhelp"
  +      mv "$out/share/doc" "$devdoc/share/devhelp/books"
  +    '' + lib.optionalString stdenv.isDarwin ''
  +      # meson erroneously installs loaders with .dylib extension on Darwin.
  +      # Their @rpath has to be replaced before gdk-pixbuf-query-loaders looks at them.
         for f in $out/${passthru.moduleDir}/*.dylib; do
             install_name_tool -change @rpath/libgdk_pixbuf-2.0.0.dylib $out/lib/libgdk_pixbuf-2.0.0.dylib $f
             mv $f ''${f%.dylib}.so
         done
  -    ''
  -    # All except one utility seem to be only useful during building.
  -    + ''
  -      moveToOutput "bin" "$dev"
  -      moveToOutput "bin/gdk-pixbuf-thumbnailer" "$out"
       '' + lib.optionalString (stdenv.hostPlatform == stdenv.buildPlatform) ''
         # We need to install 'loaders.cache' in lib/gdk-pixbuf-2.0/2.10.0/
         $dev/bin/gdk-pixbuf-query-loaders --update-cache
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "gdk-pixbuf";
    version = "2.42.2";
  
    outputs = [ "out" "dev" "man" "devdoc" "installedTests" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
      sha256 = "05ggmzwvrxq9w4zcvmrnnd6qplsmb4n95lj4q607c7arzlf6mil3";
    };
  
    patches = [
  
negative.code: , pkg-config
  , gettext
  , python3
  , libxslt
  , docbook-xsl-nons
  , docbook_xml_dtd_43
  , gi-docgen
  , glib
  , libtiff
  , libjpeg
  