diff --git a/common.h b/common.h
index 3503a95..7243104 100644
--- a/common.h
+++ b/common.h
@@ -34,6 +34,10 @@
 #include <sys/capability.h>
 #endif
 
+#ifdef __APPLE__
+#include <AvailabilityMacros.h>
+#endif
+
 #include "config.h"
 #include "version.h"
 
@@ -182,6 +186,10 @@ extern struct sslhcfg_item cfg;
 extern struct addrinfo *addr_listen;
 extern const char* server_type;
 
+#if defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED < 1080)
+extern int hosts_ctl();
+#endif
+
 /* sslh-fork.c */
 void start_shoveler(int);