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