anchor.diff:  
     postPatch = ''
       sed -i 's,$(DESTDIR)/usr/share,$out/share,g' Makefile.in
  +
  +    sed \
  +      -e 's,GENL_LIB=.*,GENL_LIB=nl-genl-3,' \
  +      -e 's,NL3_LIB=.*,NL3_LIB=nl-3,' \
  +      -e 's,ROUTE_LIB=.*,ROUTE_LIB=nl-route-3,' \
  +      -i configure
  +
  +    cat configure
     '';
   
     configureFlags = [
       "--sysconfdir=/etc"
       "--localstatedir=/var"
  +    "--disable-silent-rules"
       "--enable-snmp"
       "--enable-snmp-vrrp"
       "--enable-snmp-checker"
  
positive.code: }:
  
  let
    version = "1.3.7";
  in
  stdenv.mkDerivation rec {
    name = "keepalived-${version}";
  
    src = fetchurl {
      url = "http://keepalived.org/software/${name}.tar.gz";
      multihash = "QmeJZoLgSBhyKv1RyWxV1UrTT3YpjnoqhheAQAKRk4SjNQ";
      sha256 = "0a9f9e5eb598fc63401c90855d9cd0b3cb4345a392dd72e7d0ae559a2ee22f97";
    };
  
    nativeBuildInputs = [
  
negative.code: , glib
  , ipset
  , iptables
  , json-c
  , libnfnetlink
  , libnl
  , net-snmp
  