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error in command line

my cord // include the librealsense C++ header file

include <librealsense2 rs.hpp="">

// include OpenCV header file

include <opencv2 opencv.hpp="">

using namespace std; using namespace cv;

int main() { //Contruct a pipeline which abstracts the device rs2::pipeline pipe;

//Create a configuration for configuring the pipeline with a non default profile
rs2::config cfg;

//Add desired streams to configuration
cfg.enable_stream(RS2_STREAM_COLOR, 640, 480, RS2_FORMAT_BGR8, 30);

//Instruct pipeline to start streaming with the requested configuration
pipe.start(cfg);

// Camera warmup - dropping several first frames to let auto-exposure stabilize
rs2::frameset frames;
for(int i = 0; i < 30; i++)
{
    //Wait for all configured streams to produce a frame
    frames = pipe.wait_for_frames();
}

//Get each frame
rs2::frame color_frame = frames.get_color_frame();

// Creating OpenCV Matrix from a color image
Mat color(Size(640, 480), CV_8UC3, (void*)color_frame.get_data(), Mat::AUTO_STEP);

// Display in a GUI
namedWindow("Display Image", WINDOW_AUTOSIZE );
imshow("Display Image", color);

waitKey(0);

return 0;

}

and my command

g++ -std=c++11 BGR_sample.cpp -lrealsense2 -lopencv_core -lopencv_highgui -o BGR && ./BGR

but error

/usr/bin/ld: /tmp/ccOsYVa0.o: undefined reference to symbol '_ZN2cv6String10deallocateEv' //usr/local/lib/libopencv_core.so.3.4: error adding symbols: DSO missing from command line

error in command line

my cord

// include the librealsense C++ header file
 include <librealsense2 rs.hpp="">
 file
#include <librealsense2/rs.hpp>

// include OpenCV header file
 include <opencv2 opencv.hpp="">
 file
#include <opencv2/opencv.hpp>

using namespace std;
using namespace cv;
 cv;

int main()
{
    //Contruct a pipeline which abstracts the device
    rs2::pipeline pipe;
 pipe;

    //Create a configuration for configuring the pipeline with a non default profile
 rs2::config cfg;

 //Add desired streams to configuration
 cfg.enable_stream(RS2_STREAM_COLOR, 640, 480, RS2_FORMAT_BGR8, 30);

 //Instruct pipeline to start streaming with the requested configuration
 pipe.start(cfg);

 // Camera warmup - dropping several first frames to let auto-exposure stabilize
 rs2::frameset frames;
 for(int i = 0; i < 30; i++)
 {
     //Wait for all configured streams to produce a frame
     frames = pipe.wait_for_frames();
 }

 //Get each frame
 rs2::frame color_frame = frames.get_color_frame();

 // Creating OpenCV Matrix from a color image
 Mat color(Size(640, 480), CV_8UC3, (void*)color_frame.get_data(), Mat::AUTO_STEP);

 // Display in a GUI
 namedWindow("Display Image", WINDOW_AUTOSIZE );
 imshow("Display Image", color);

 waitKey(0);

 return 0;
}
 } and my command 
 
g++ -std=c++11 BGR_sample.cpp -lrealsense2 -lopencv_core -lopencv_highgui -o BGR && ./BGR./BGR
 but error
 
/usr/bin/ld: /tmp/ccOsYVa0.o: undefined reference to symbol '_ZN2cv6String10deallocateEv'
//usr/local/lib/libopencv_core.so.3.4: error adding symbols: DSO missing from command lineline