anchor.diff:    pname = "gtk-doc";
     version = "1.30";
   
  -  src = fetchurl {
  -    url = "mirror://gnome/sources/${pname}/${stdenv.lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
  -    sha256 = "17h6nwhis66z4dxjrc833wvfl6pqjp81yfx3fq6x7k1qp2749xm4";
  +  src = fetchFromGitLab {
  +    domain = "gitlab.gnome.org";
  +    owner = "GNOME";
  +    repo = pname;
  +    rev = "GTK_DOC_${stdenv.lib.replaceStrings ["."] ["_"] version }";
  +    sha256 = "05lr6apj3pd3s59a7k6p45k9ywwrp577ra4pvkhxvb5p7v90c2fi";
     };
   
     patches = [
  
positive.code: { stdenv, fetchurl, autoreconfHook, pkgconfig, perl, python3, libxml2Python, libxslt, which
  , docbook_xml_dtd_43, docbook_xsl, gnome-doc-utils, gettext, itstool, gnome3
  , withDblatex ? false, dblatex
  }:
  
  
negative.code: 
    outputDevdoc = "out";
  
    nativeBuildInputs = [
      gettext
      meson
      ninja
    ];
  
    buildInputs = [
      docbook_xml_dtd_43
      docbook_xsl
      libxslt
      pkgconfig
      python3
      libxml2Python
    ]
    ++ stdenv.lib.optional withDblatex dblatex
    ;
  
    mesonFlags = [
      "-Dtests=false"
      "-Dyelp_manual=false"
    ];
  
    # Make pygments available for binaries, python.withPackages creates a wrapper
    # but scripts are not allowed in shebangs so we link it into sys.path.
  