anchor.diff:  , iproute, iptables, readline, lvm2, utillinux, systemd, libpciaccess, gettext
   , libtasn1, ebtables, libgcrypt, yajl, pmutils, libcap_ng, libapparmor
   , dnsmasq, libnl, libpcap, libxslt, xhtml1, numad, numactl, perlPackages
  -, curl, libiconv, gmp, zfs, parted, bridge-utils, dmidecode, jansson
  +, curl, libiconv, gmp, zfs, parted, bridge-utils, dmidecode
   , enableXen ? false, xen ? null
   , enableIscsi ? false, openiscsi
   }:
  
positive.code:     "--localstatedir=/var"
      "--sysconfdir=/var/lib"
      "--with-libpcap"
      "--with-qemu"
      "--with-vmware"
      "--with-vbox"
      "--with-test"
  
negative.code:   nativeBuildInputs = [ makeWrapper pkgconfig ];
    buildInputs = [
      libxml2 gnutls perl python2 readline gettext libtasn1 libgcrypt yajl
      libxslt xhtml1 perlPackages.XMLXPath curl libpcap
    ] ++ optionals (!buildFromTarball) [
      libtool autoconf automake
    ] ++ optionals stdenv.isLinux [
      libpciaccess lvm2 lvm2 utillinux systemd libnl numad zfs
      libapparmor libcap_ng numactl attr parted
    ] ++ optionals (enableXen && stdenv.isLinux && stdenv.isx86_64) [
      xen
  