anchor.diff:  , libxcb
   , libxkbfile
   , libxshmfence
  +, libxcvt
   , mesa
   , meson
   , ninja
  
positive.code: stdenv.mkDerivation rec {
  
    pname = "xwayland";
    version = "21.1.4";
    src = fetchurl {
      url = "mirror://xorg/individual/xserver/${pname}-${version}.tar.xz";
      sha256 = "sha256-GfZ5XzHPqOs1Kx5bPDefIu5gIOmHAf8sxnnajE8RWfc=";
    };
  
    depsBuildBuild = [
  
negative.code:     libxcb
      libxkbfile
      libxshmfence
      libxcvt
      mesa
      openssl
      pixman
  