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