anchor.diff: -{ stdenv, fetchurl, libmatchbox, pkgconfig}:
  +{ stdenv, fetchurl, pkgconfig, libmatchbox, libX11, libXext }:
   
   stdenv.mkDerivation rec {
     name = "matchbox-${version}";
  
positive.code: 
    nativeBuildInputs = [ pkgconfig ];
    buildInputs = [ libmatchbox ];
  
    src = fetchurl {
      url = "https://downloads.yoctoproject.org/releases/matchbox/matchbox-window-manager/${version}/matchbox-window-manager-${version}.tar.bz2";
  
negative.code: 
    meta = {
      description = "X window manager for non-desktop embedded systems";
      homepage = "https://www.yoctoproject.org/software-item/matchbox/";
      license = stdenv.lib.licenses.gpl2Plus;
      platforms = stdenv.lib.platforms.linux;
    };
  