anchor.diff:  { stdenv, fetchurl, python, zlib, pkgconfig, glib, ncurses, perl, pixman
   , attr, libcap, vde2, alsaLib, texinfo, libuuid, flex, bison, lzo, snappy
  -, libseccomp, libaio, libcap_ng, gnutls, nettle
  +, libseccomp, libaio, libcap_ng, gnutls, nettle, numactl
   , makeWrapper
   , pulseSupport ? true, libpulseaudio
   , sdlSupport ? true, SDL
  
positive.code:   buildInputs =
      [ python zlib pkgconfig glib ncurses perl pixman attr libcap
        vde2 texinfo libuuid flex bison makeWrapper lzo snappy libseccomp
        libcap_ng gnutls nettle
      ]
      ++ optionals pulseSupport [ libpulseaudio ]
      ++ optionals sdlSupport [ SDL ]
  
negative.code: 
    configureFlags =
      [ "--enable-seccomp"
        "--enable-numa"
        "--smbd=smbd" # use `smbd' from $PATH
        "--audio-drv-list=${audio}"
        "--sysconfdir=/etc"
  