--- src/ocatresolv.h.orig	2022-08-23 01:20:20.000000000 +0800
+++ src/ocatresolv.h	2023-01-15 13:51:20.000000000 +0800
@@ -33,6 +33,7 @@
 #endif
 #include "ocathosts.h"
 
+#include <arpa/nameser_compat.h>
 
 #define DNS_MAX_RETRY 5
 #define DNS_RETRY_TIMEOUT 5