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