anchor.diff:  { stdenv, fetchurl, pkgconfig
  -, boost, libyamlcpp, libsodium, sqlite, protobuf, openssl
  +, boost, libyamlcpp, libsodium, sqlite, protobuf, openssl, systemd
   , mysql57, postgresql, lua, openldap, geoip, curl, opendbx, unixODBC
   }:
   
  
positive.code:   nativeBuildInputs = [ pkgconfig ];
    buildInputs = [
      boost mysql57.connector-c postgresql lua openldap sqlite protobuf geoip
      libyamlcpp libsodium curl opendbx unixODBC openssl
    ];
  
    # nix destroy with-modules arguments, when using configureFlags
  
negative.code:       --disable-silent-rules
        --enable-reproducible
        --enable-unit-tests
        --enable-systemd
      )
    '';
  
  