Added the const qualifier for char* argument of Py_EnterRecursiveCall().
diff --git a/Include/ceval.h b/Include/ceval.h
index 0e8bd2a..3735f00 100644
--- a/Include/ceval.h
+++ b/Include/ceval.h
@@ -50,7 +50,7 @@
              _Py_CheckRecursiveCall(where))
 #define Py_LeaveRecursiveCall()                         \
             (--PyThreadState_GET()->recursion_depth)
-PyAPI_FUNC(int) _Py_CheckRecursiveCall(char *where);
+PyAPI_FUNC(int) _Py_CheckRecursiveCall(const char *where);
 PyAPI_DATA(int) _Py_CheckRecursionLimit;
 #ifdef USE_STACKCHECK
 #  define _Py_MakeRecCheck(x)  (++(x) > --_Py_CheckRecursionLimit)