Why rfnoc_graph can not initialize in Gnuradio and CPP, (undefined reference)

[sp h]

Why rfnoc_graph can not initialize in Gnuradio and CPP, I was faced with 

some undefined symbol errors...

I include these header files and below is the source file...

#include <ettus/rfnoc_block.h>

#include <ettus/rfnoc_graph.h>

#include <ettus/rfnoc_block_generic.h>

#include <uhd/rfnoc_graph.hpp>

 const::uhd::device_addr_t device("addr=192.168.10.2");

        gr::ettus::rfnoc_graph::sptr rfnoc_graph_ctrl=gr::ettus::rfnoc_graph::make(device);

But when i want to compile it...I was faced with some erros...how can I solve problems....thanks in advance

 error: undefined reference to `gr::ettus::rfnoc_graph::make(uhd::device_addr_t const&)'