c – 错误：“对’gluNewQuadric @ 0’的未定义引用”

undefined reference to `gluNewQuadric@0′

undefined reference to `gluQuadricDrawStyle@8′

undefined reference to `gluDeleteQuadric@4

违规代码在这里：

#include <SFML/Graphics.hpp>
#include <SFML/Window.hpp>
#include <SFML/System.hpp>   

sf::WindowSettings Settings;
Settings.AntialiasingLevel = 2;
Settings.DepthBits = 24;
Settings.StencilBits = 8;
sf::Window  App(sf::VideoMode(1024,768,32),"SFML Window",sf::Style::Close,Settings);
App.SetFramerateLimit(30);
prepareGL(App.GetWidth(),App.GetHeight());
sf::Clock Clock;
App.SetActive();
// GL goes here:
GLUquadricObj *qw1 = gluNewQuadric();
gluQuadricDrawStyle(qw1,GLU_POINT);
App.Display();
while (App.IsOpened()) {
    sf::Event Event;
    while (App.GetEvent(Event)) {
        if (((Event.Type == sf::Event::KeyPressed)
            && (Event.Key.Code == sf::Key::Escape))
            || (Event.Type == sf::Event::Closed)) {
            gluDeleteQuadric(qw1);
            App.Close();
        }
        if (Event.Type == sf::Event::Resized) {
            glViewport(0,Event.Size.Width,Event.Size.Height);
        }
    }
}
return EXIT_SUCCESS;

我做错了什么？通常,我用Java编写代码,而这个项目我正在做更多关于C/C++的知识.之前我做过其他的OpenGL程序,之前我没有这样的问题.