Compiler unable to link/find GLFW [duplicate] - c++

Question

This question already has answers here:
How do I link GLFW
(3 answers)
Closed 4 years ago.
I am trying to run a modified program that can be found at cpp-pointcloud.cpp. I am having difficulties getting it to build.
As it is now my file structure is:
-pointcloud.cpp
-librealsense/
-examples
-example.hpp
And I am building it with the command:
g++ -std=c++11 pointcloud.cpp -lrealsense -lopencv_core -lopencv_imgproc -lopencv_highgui -o ir
The imports of the pointcloud.cpp file are as follows:
// License: Apache 2.0. See LICENSE file in root directory.
// Copyright(c) 2015 Intel Corporation. All Rights Reserved.
#include <librealsense/rs.hpp>
#include <librealsense2/rs.hpp>
#include "librealsense/examples/example.hpp"
#include <chrono>
#include <vector>
#include <sstream>
#include <iostream>
#include <algorithm>
And they are:
#pragma once
#define GLFW_INCLUDE_GLU
#include <GLFW/glfw3.h>
#include <vector>
#include <string>
#include <sstream>
#include <iostream>
#include <algorithm>
In the example.hpp file.
My issue is that it cannot seem to find the glfw files. I get a bunch of errors like:
pointcloud.cpp:(.text+0xdf5): undefined reference to `glPopMatrix'
Which is bizarre to me as I'm confident that i've installed the GLFW3 package. And I believed that includes that use the angle brackets search for installed packages on your operating system.
I've ran this command successfully:
sudo apt-get install libglfw3 libglfw3-dev
I tried adding
#include <GLFW/glfw3.h>
to the pointcloud.cpp file but it actually gave me more errors!
I miss be misunderstanding something conceptually here, so if any of you could point me in the right direction that would be great thanks.

Answer 1

You have to link GLFW with pkg-config cf How do I link GLFW
$ gcc `pkg-config --cflags glfw3` -o foo foo.c `pkg-config --static --libs glfw3`
you can locate the libraries using locate or whereis ( update database before with sudo updatedb , https://unix.stackexchange.com/questions/194088/how-to-check-if-a-shared-library-is-installed ) or find ( /www.lifewire.com/uses-of-linux-command-find-2201100 ) i.e.
sudo updatedb ( may take some time ... )
locate libglfw
or
sudo find /usr/lib -name '*libglfw*'
possibly also check all dependencies required for libglfw using ldd