hnbgw_cn.c: add #include for inet_ntoa()
diff --git a/src/hnbgw_cn.c b/src/hnbgw_cn.c
index 6d0687b..1361736 100644
--- a/src/hnbgw_cn.c
+++ b/src/hnbgw_cn.c
@@ -18,6 +18,8 @@
  *
  */
 
+#include <arpa/inet.h>
+
 #include <osmocom/core/msgb.h>
 #include <osmocom/core/utils.h>
 #include <osmocom/core/timer.h>