From adccbc9f2a4be7089f3c68c221bbfe7cecabbb9c Mon Sep 17 00:00:00 2001
From: Erik Ekman <eekman@google.com>
Date: Fri, 20 Aug 2021 17:33:47 +0200
Subject: [PATCH] pkg/lwip: Fix compilation without IPv6

RIOT/pkg/lwip/init_devs/init.c:65:61: error: 'tcpip_6lowpan_input' undeclared (first use in this function)
     return netif_add_noaddr(netif, state, lwip_netdev_init, tcpip_6lowpan_input);
                                                             ^
---
 pkg/lwip/include/lwip_init_devs.h | 2 ++
 pkg/lwip/init_devs/init.c         | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/pkg/lwip/include/lwip_init_devs.h b/pkg/lwip/include/lwip_init_devs.h
index f048cb6293..3e65453ba3 100644
--- a/pkg/lwip/include/lwip_init_devs.h
+++ b/pkg/lwip/include/lwip_init_devs.h
@@ -41,6 +41,7 @@ void lwip_netif_init_devs(void);
  */
 struct netif *lwip_add_ethernet(struct netif *netif, netdev_t *state);
 
+#if IS_USED(MODULE_LWIP_SIXLOWPAN)
 /**
  * @brief Adds a 6LoWPAN netif using the supplied netdev.
  *
@@ -50,6 +51,7 @@ struct netif *lwip_add_ethernet(struct netif *netif, netdev_t *state);
  * The netif will be set up using the `lwip_netdev_init` helper.
  */
 struct netif *lwip_add_6lowpan(struct netif *netif, netdev_t *state);
+#endif /* MODULE_LWIP_SIXLOWPAN */
 
 typedef void (*lwip_netif_setup_func_t)(void);
 
diff --git a/pkg/lwip/init_devs/init.c b/pkg/lwip/init_devs/init.c
index bb567e9a27..c5ea854e96 100644
--- a/pkg/lwip/init_devs/init.c
+++ b/pkg/lwip/init_devs/init.c
@@ -60,9 +60,11 @@ struct netif *lwip_add_ethernet(struct netif *netif, netdev_t *state)
     return _if;
 }
 
+#if IS_USED(MODULE_LWIP_SIXLOWPAN)
 struct netif *lwip_add_6lowpan(struct netif *netif, netdev_t *state)
 {
     return netif_add_noaddr(netif, state, lwip_netdev_init, tcpip_6lowpan_input);
 }
+#endif /* MODULE_LWIP_SIXLOWPAN */
 
 /**@}*/