anchor.diff:    NIX_CFLAGS_COMPILE = "-DG_ENABLE_DEBUG -DG_DISABLE_CAST_CHECKS";
   
     postPatch = ''
  -    # TODO: Remove in 3.24.21
  -    # https://gitlab.gnome.org/GNOME/gtk/issues/2669
  -    echo "${stdenv.shell}" > check-version.py
  -    chmod +x check-version.py
  -
       files=(
         build-aux/meson/post-install.py
         demos/gtk-demo/geninclude.py
  
positive.code:     docbook_xml_dtd_43
      docbook_xsl
      gtk-doc
    ];
  
    buildInputs = [
  
negative.code:       sha256 = "0g6fhqcv8spfy3mfmxpyji93k8d4p4q4fz1v9a1c1cgcwkz41d7p";
      })
  
      # Fix path handling in pkg-config. MR for the gtk-3-24 branch:
      # https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/2605
      (fetchpatch {
        url = "https://gitlab.gnome.org/GNOME/gtk/commit/6d9db8610eff8c12d594d53b7813d9eea1247801.patch";
        sha256 = "0rd1kjh0m4mrj2hkcqlsq1j0d6ahn5c237fd211r158gd1jiwys0";
  