anchor.diff:      desktop-file-utils
     ];
   
  +  mesonFlags = [
  +    "-Dgtk_doc=true"
  +  ];
  +
     postPatch = ''
  -     chmod +x meson_post_install.py
  -     patchShebangs meson_post_install.py
  +    chmod +x meson_post_install.py
  +    patchShebangs meson_post_install.py
  +  '';
  +
  +  postFixup = ''
  +    # Cannot be in postInstall, otherwise _multioutDocs hook in preFixup will move right back.
  +    moveToOutput "share/doc" "$devdoc"
     '';
   
     passthru = {
  
positive.code:     meson
      ninja
      pkg-config
      python3
      wrapGAppsHook
    ];
  
    buildInputs = [
      gtk3
      atk
      glib
    ];
  
negative.code: , gettext
  , itstool
  , libxml2
  , gtk4
  , glib
  , atk
  , gobject-introspection
  , wrapGAppsHook
  }:
  
  stdenv.mkDerivation rec {
    pname = "ghex";
    version = "4.beta.1";
  
    outputs = [ "out" "dev" "devdoc" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/ghex/${version}/${pname}-${version}.tar.xz";
      sha256 = "sBS/9cY++uHLGCbLeex8ZW697JJn3dK+HaM6tHBdwJ4=";
    };
  
    patches = [
      # Fix build with -Werror=format-security
      (fetchpatch {
        url = "https://gitlab.gnome.org/GNOME/ghex/-/commit/3d35359f3a12b6abb4a3d8a12a0f39b7221be408.patch";
        sha256 = "4z9nUd+/eBOUGwl3MErse+FKLzGqtWKwkIzej57CnYk=";
      })
      # Build devhelp index.
      # https://gitlab.gnome.org/GNOME/ghex/-/merge_requests/25
      (fetchpatch {
        url = "https://gitlab.gnome.org/GNOME/ghex/-/commit/b26a7b1135ea2fe956a9bc0669b3b6ed818716c3.patch";
        sha256 = "nYjjxds9GNWkW/RhXEe5zJzPF4TnLMsCELEqYR4dXTk=";
      })
    ];
  
    nativeBuildInputs = [
      desktop-file-utils
  