anchor.diff:      "--localstatedir=/var"
       "--sysconfdir=/etc"
       "--with-init-script=redhat"
  -    "--without-macvtap"
  +    "--with-macvtap"
  +    "--with-virtualport"
     ];
   
     installFlags = [
  
positive.code:   buildInputs = [
      pkgconfig libxml2 gnutls devicemapper perl python readline lvm2
      utillinux udev libpciaccess gettext libtasn1 libgcrypt yajl makeWrapper
      libcap_ng
    ];
  
    preConfigure = ''
  
negative.code: { stdenv, fetchurl, pkgconfig, libxml2, gnutls, devicemapper, perl, python
  , iproute, iptables, readline, lvm2, utillinux, udev, libpciaccess, gettext
  , libtasn1, ebtables, libgcrypt, yajl, makeWrapper, pmutils, libcap_ng
  , dnsmasq, libnl
  }:
  
  let version = "1.2.2"; in
  