anchor.diff:  
     nativeBuildInputs = [ pkgconfig ];
     buildInputs = [ libmatchbox ];
  +  NIX_LDFLAGS = "-lX11 -L${libX11}/lib -lXext -L${libXext}/lib";
   
     src = fetchurl {
       url = "https://downloads.yoctoproject.org/releases/matchbox/matchbox-window-manager/${version}/matchbox-window-manager-${version}.tar.bz2";
  
positive.code: 
    meta = {
      description = "X window manager for non-desktop embedded systems";
      homepage = http://matchbox-project.org/;
      license = stdenv.lib.licenses.gpl2Plus;
      platforms = stdenv.lib.platforms.linux;
    };
  
negative.code: { stdenv, fetchurl, pkgconfig, libmatchbox, libX11, libXext }:
  
  stdenv.mkDerivation rec {
    name = "matchbox-${version}";
  