-YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
-int line_stack[MAX_INCLUDE_DEPTH];
-int column_stack[MAX_INCLUDE_DEPTH];
-int include_stack_ptr = 0;
+static YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
+static int line_stack[MAX_INCLUDE_DEPTH];
+static int column_stack[MAX_INCLUDE_DEPTH];
+static int include_stack_ptr = 0;