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