anchor.diff:  
     configureFlags = [
       "--localstatedir=/var"
  -    "--with-botan-config=${botan}/bin/botan-config-1.10"
       "--with-dhcp-pgsql=${postgresql}/bin/pg_config"
       "--with-dhcp-mysql=${mysql.client.dev}/bin/mysql_config"
     ];
  
positive.code: { stdenv, fetchurl, autoreconfHook, pkgconfig, openssl, botan, log4cplus
  , boost, python3, postgresql, mysql, gmp, bzip2 }:
  
  stdenv.mkDerivation rec {
  
negative.code:   nativeBuildInputs = [ autoreconfHook pkgconfig ];
    buildInputs = [
      openssl log4cplus boost python3 mysql.client
      botan2 gmp bzip2
    ];
  
    enableParallelBuilding = true;
  