diff --git a/src/rap_opt.h b/src/rap_opt.h
index 919ca1a..fe504e9 100644
--- a/src/rap_opt.h
+++ b/src/rap_opt.h
@@ -7,6 +7,18 @@ We supply the API for RAP  */
 
 extern int rap_available_naive(tree p, tree func); 
 
+/* This function is defined in gcc/c-decl.c */
+extern tree lookup_name(tree);
+/* */
+#define I_SYMBOL_BINDING(node) \
+  (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
+
+#define RAP_POINTER_TO_FUNCTION(P)
+
+/* This is defined in gcc/c-decl.c but as static linkage, so we reuse it here.
+   And the depth of external scope is 0. 
+   If scope depth is more than 1 it's local scope */
+#define FILE_SCOPE_DEPTH 1
 
 
 #endif /* RAP_OPT_H */
diff --git a/src/rap_opt_pass0.c b/src/rap_opt_pass0.c
index e78cc35..0bf9631 100644
--- a/src/rap_opt_pass0.c
+++ b/src/rap_opt_pass0.c
@@ -2,6 +2,7 @@
    We supply the API for RAP  */
 
 #include "gcc-common.h"
+#include "rap_opt.h"
 
 //#include "set.h"
 
@@ -33,7 +34,6 @@ register_callback(plugin_name, PLUGIN_FINISH_UNIT, rap_gather_avail_function,
                   &func_set);
 
 
-#define RAP_POINTER_TO_FUNCTION(P) 
 /*
 
 */