---
title: Enabling flags
---

- `MG_ENABLE_SSL` Enable OpenSSL support
- `MG_ENABLE_IPV6` Enable IPV6 support
- `MG_ENABLE_THREADS` enable `mg_start_thread()` API
- `MG_ENABLE_MQTT_BROKER` enable MQTT broker
- `MG_ENABLE_DNS_SERVER` enable DNS server
- `MG_ENABLE_COAP` enable CoAP protocol
- `MG_ENABLE_GETADDRINFO` enable `getaddrinfo()` in `mg_resolve2()`