anchor.diff:  { lib, stdenv, fetchurl, makeWrapper, pkg-config, kronosnet, nss, nspr, libqb
  -, dbus, rdma-core, libstatgrab, net-snmp
  +, systemd, dbus, rdma-core, libstatgrab, net-snmp
   , enableDbus ? false
   , enableInfiniBandRdma ? false
   , enableMonitoring ? false
  
positive.code:     "--with-logdir=/var/log/corosync"
      "--enable-watchdog"
      "--enable-qdevices"
    ] ++ optional enableDbus "--enable-dbus"
      ++ optional enableInfiniBandRdma "--enable-rdma"
      ++ optional enableMonitoring "--enable-monitoring"
  
negative.code:   nativeBuildInputs = [ makeWrapper pkg-config ];
  
    buildInputs = [
      kronosnet nss nspr libqb systemd.dev
    ] ++ optional enableDbus dbus
      ++ optional enableInfiniBandRdma rdma-core
      ++ optional enableMonitoring libstatgrab
  