anchor.diff: -{ lib, stdenv, fetchurl, pkgconfig
  +{ lib, stdenv, fetchurl, meson, pkgconfig, ninja
   , libffi, libxml2, wayland
   , expat ? null # Build wayland-scanner (currently cannot be disabled as of 1.7.0)
   }:
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "wayland";
    version = "1.17.0";
  
    src = fetchurl {
      url = "https://wayland.freedesktop.org/releases/${pname}-${version}.tar.xz";
      sha256 = "194ibzwpdcn6fvk4xngr4bf5axpciwg2bj82fdvz88kfmjw13akj";
    };
  
    separateDebugInfo = true;
  
    configureFlags = [
      "--disable-documentation"
    ] ++ lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
      "--with-host-scanner"
    ];
  
    nativeBuildInputs = [
      pkgconfig
    ] ++ lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
      # for wayland-scanner during build
      wayland
  
negative.code:   buildInputs = [ libffi /* docbook_xsl doxygen graphviz libxslt xmlto */ expat libxml2 ];
  
    meta = {
      description = "Core Wayland window system code and protocol";
      longDescription = ''
        Wayland is a project to define a protocol for a compositor to talk to its
        clients as well as a library implementation of the protocol.
        The wayland protocol is essentially only about input handling and buffer
        management, but also handles drag and drop, selections, window management
        and other interactions that must go through the compositor (but not
        rendering).
      '';
      homepage    = https://wayland.freedesktop.org/;
      license     = lib.licenses.mit; # Expat version
      platforms   = lib.platforms.linux;
      maintainers = with lib.maintainers; [ primeos codyopel ];
    };
  
    passthru.version = version;
  