anchor.diff:    configureFlags = [
       "--sysconfdir=/etc"
       "--localstatedir=/var"
  -    #"--enable-snmp"
  -    #"--enable-snmp-keepalived"
  -    #"--enable-snmp-checker"
  -    #"--enable-snmp-rfc"
  -    #"--enable-snmp-rfcv2"
  -    #"--enable-snmp-rfcv3"
  +    "--enable-snmp"
  +    "--enable-snmp-keepalived"
  +    "--enable-snmp-checker"
  +    "--enable-snmp-rfc"
  +    "--enable-snmp-rfcv2"
  +    "--enable-snmp-rfcv3"
       "--enable-sha1"
     ];
   
  -  installFlags = [
  -    "sysconfdir=\${out}/etc"
  -  ];
  +  preInstall = ''
  +    installFlagsArray+=("sysconfdir=$out/etc")
  +  '';
   
     meta = with stdenv.lib; {
       homepage = http://keepalived.org;
  
positive.code: { stdenv
  , fetchFromGitHub
  
  , ipset
  , iptables
  
negative.code:     iptables
      libnfnetlink
      libnl
      net-snmp
      openssl
    ];
  
  