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