--- asterisk-11.7.0.orig/main/ast_expr2.c
+++ asterisk-11.7.0/main/ast_expr2.c
@@ -93,6 +93,7 @@
 
 #include "asterisk.h"
 
+#include <sys/cdefs.h>
 #include <sys/types.h>
 #include <stdio.h>
 
--- asterisk-11.7.0.orig/main/ast_expr2.y
+++ asterisk-11.7.0/main/ast_expr2.y
@@ -14,6 +14,7 @@
 
 #include "asterisk.h"
 
+#include <sys/cdefs.h>
 #include <sys/types.h>
 #include <stdio.h>