尝试使用 glLoadGen 时出现链接错误

在阅读OpenGL 4着色语言食谱时，我遇到了OpenGL Loader Gen库，并立即想尝试一下。我开始创建一个小的示例程序，你可以在下面看到。

#include "GLFW/glfw3.h"
#include "GL/gl_core_4_1.hpp"
namespace engine
{
class Window
{
private:
const unsigned int width;
const unsigned int height;
const char *title;
const void refresh()
{
glfwSwapBuffers(this -> glfwWindow);
glfwPollEvents();
}
protected:
GLFWwindow *glfwWindow;
public:
Window(const unsigned int width, const unsigned int height, const char title[]): width(width), height(height), title(title)
{
if (glfwInit() != GLFW_TRUE)
{
throw "Couldn't initialise the required GLFW library.";
}
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
if (this -> glfwWindow)
{
throw "Cannot create a secondary window.";
}
this -> glfwWindow = glfwCreateWindow(this -> width, this -> height, this -> title, NULL, NULL);
// This is the crucial line that will stop the program from compiling.
gl::exts::LoadTest context = gl::sys::LoadFunctions();
if (!context)
{
throw "Couldn't initialse the required GL library.";
}
glfwMakeContextCurrent(this -> glfwWindow);
glfwSwapInterval(GLFW_TRUE);
if (!glfwWindow)
{
glfwTerminate();
throw "Couldn't create a new initially empty window.";
}
}
const bool await()
{
this -> refresh();
if (glfwWindowShouldClose(this -> glfwWindow))
{
glfwDestroyWindow(this -> glfwWindow);
glfwTerminate();
return false;
}
return true;
}
};
}
int main(const int argc, const char *argv[])
{
engine::Window window(1280, 720, "Foundation");
while (window.await())
{
}
return 0x00000000;
}

我的下一步是尝试在macOS High Sierra操作系统上运行的计算机上使用LLVM编译器编译程序。

clang++ -o Application.exec Subdirectory/*.cpp -lglfw -framework Cocoa -framework OpenGL -framework IOKit -framework CoreVideo

但是，在编译过程中，我收到以下意外的链接器错误：

Undefined symbols for architecture x86_64:
"gl::sys::LoadFunctions()", referenced from:
engine::Window::Window(unsigned int, unsigned int, char const*) in Application-58a670.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

这是我的实际问题：如何让上面显示的程序使用前面提到的 OpenGL Loader Gen 库进行编译？