Undefined constant "Socket\Raw\AF_INET"

I am getting this error
Undefined constant "Socket\Raw\AF_INET"
in file
\vendor\clue\socket-raw\src\Factory.php:78

Code
```
$host = "aspmx.l.google.com";
$port = 25;

$client = Graze\TelnetClient\TelnetClient::factory();
$dsn = $host.":".$port;
$client->connect($dsn);
```