我在Ubuntu 20.04 LTS系统上，我无法运行CPP代码。每次我试图编译这个：

#include <iostream>
#include <GLFW/glfw3.h>
#include "glad/glad.h"
int main()
{
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    GLFWwindow* window = glfwCreateWindow(800, 800, "Endless Space", NULL, NULL);
    if (window == NULL)
    {
        std::cout << "FAILED TO LAUNCH WINDOW! TERMINATING..." << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    do {
        glfwPollEvents();
    }
    while (!glfwWindowShouldClose);
    glfwDestroyWindow(window);
    glfwTerminate();
    return 0;
}

字符串
通过此命令：g++ main.cpp -o EndlessSpace
我收到这个错误：

In file included from main.cpp:3:
glad/glad.h:27:2: error: #error OpenGL header already included, remove this include, glad already provides it
   27 | #error OpenGL header already included, remove this include, glad already provides it
      |  ^~~~~
In file included from main.cpp:3:
glad/glad.h:1305: warning: "GL_INVALID_INDEX" redefined
 1305 | #define GL_INVALID_INDEX 0xFFFFFFFF
      | 
In file included from /usr/include/GL/gl.h:2050,
                 from /usr/include/GLFW/glfw3.h:210,
                 from main.cpp:2:
/usr/include/GL/glext.h:1355: note: this is the location of the previous definition
 1355 | #define GL_INVALID_INDEX                  0xFFFFFFFFu
      | 
In file included from main.cpp:3:
glad/glad.h:1347: warning: "GL_TIMEOUT_IGNORED" redefined
 1347 | #define GL_TIMEOUT_IGNORED 0xFFFFFFFFFFFFFFFF
      | 
In file included from /usr/include/GL/gl.h:2050,
                 from /usr/include/GLFW/glfw3.h:210,
                 from main.cpp:2:
/usr/include/GL/glext.h:1430: note: this is the location of the previous definition
 1430 | #define GL_TIMEOUT_IGNORED                0xFFFFFFFFFFFFFFFFull
      |

型
事实上，我已经尝试删除GLFW头，导致此错误：

main.cpp: In function ‘int main()’:
main.cpp:6:5: error: ‘glfwInit’ was not declared in this scope
    6 |     glfwInit();
      |     ^~~~~~~~
main.cpp:8:20: error: ‘GLFW_CONTEXT_VERSION_MAJOR’ was not declared in this scope
    8 |     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
      |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:8:5: error: ‘glfwWindowHint’ was not declared in this scope
    8 |     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
      |     ^~~~~~~~~~~~~~
main.cpp:9:20: error: ‘GLFW_CONTEXT_VERSION_MINOR’ was not declared in this scope
    9 |     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
      |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:10:20: error: ‘GLFW_OPENGL_PROFILE’ was not declared in this scope
   10 |     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
      |                    ^~~~~~~~~~~~~~~~~~~
main.cpp:10:41: error: ‘GLFW_OPENGL_CORE_PROFILE’ was not declared in this scope
   10 |     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:12:5: error: ‘GLFWwindow’ was not declared in this scope
   12 |     GLFWwindow* window = glfwCreateWindow(800, 800, "Endless Space", NULL, NULL);
      |     ^~~~~~~~~~
main.cpp:12:17: error: ‘window’ was not declared in this scope
   12 |     GLFWwindow* window = glfwCreateWindow(800, 800, "Endless Space", NULL, NULL);
      |                 ^~~~~~
main.cpp:12:26: error: ‘glfwCreateWindow’ was not declared in this scope
   12 |     GLFWwindow* window = glfwCreateWindow(800, 800, "Endless Space", NULL, NULL);
      |                          ^~~~~~~~~~~~~~~~
main.cpp:17:9: error: ‘glfwTerminate’ was not declared in this scope
   17 |         glfwTerminate();
      |         ^~~~~~~~~~~~~
main.cpp:21:5: error: ‘glfwMakeContextCurrent’ was not declared in this scope
   21 |     glfwMakeContextCurrent(window);
      |     ^~~~~~~~~~~~~~~~~~~~~~
main.cpp:24:9: error: ‘glfwPollEvents’ was not declared in this scope
   24 |         glfwPollEvents();
      |         ^~~~~~~~~~~~~~
main.cpp:26:13: error: ‘glfwWindowShouldClose’ was not declared in this scope
   26 |     while (!glfwWindowShouldClose);
      |             ^~~~~~~~~~~~~~~~~~~~~
main.cpp:28:5: error: ‘glfwDestroyWindow’ was not declared in this scope
   28 |     glfwDestroyWindow(window);
      |     ^~~~~~~~~~~~~~~~~
main.cpp:29:5: error: ‘glfwTerminate’ was not declared in this scope
   29 |     glfwTerminate();
      |     ^~~~~~~~~~~~~

型
为了你的信息，我确实 * 做 * 安装GLFW和.我不能真正弄清楚如何安装GLAD，所以我真的没有做太多。
请帮帮忙谢谢！