anchor.diff: -{ lib, stdenv
  +{ stdenv
  +, lib
   , fetchurl
   , gtk3
   , meson
   , ninja
   , pkg-config
   , gobject-introspection
  +, gtk-doc
  +, docbook-xsl-nons
   , gnome
   , dbus
   , xvfb-run
  
positive.code:     pkg-config
      dbus
      gobject-introspection
    ];
  
    buildInputs = [
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "amtk";
    version = "5.4.0";
  
    outputs = [ "out" "dev" "devdoc" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
      sha256 = "g10IUHo96sie91NRzOu0szWv/qNhuIvQ+mZ/QM53enA=";
    };
  
    nativeBuildInputs = [
  