title: Error with GLUT compile in ubuntu
body: <p>I try to compile some "hello world" glut application:</p>
  
  <pre><code>#include &lt;stdlib.h&gt;
  
  #include &lt;GL/gl.h&gt;
  
  #include &lt;GL/glu.h&gt;
  
  #include &lt;GL/glut.h&gt;
  
  GLint Width = 512, Height = 512;
  
  const int CubeSize = 200;
  
  void Display(void)
  {
      int left, right, top, bottom;
  
      left  = (Width - CubeSize) / 2;
      right = left + CubeSize;
      bottom = (Height - CubeSize) / 2;
      top = bottom + CubeSize;
  
      glClearColor(0, 0, 0, 1);
      glClear(GL_COLOR_BUFFER_BIT);
  
      glColor3ub(255,0,0);
      glBegin(GL_QUADS);
        glVertex2f(left,bottom);
        glVertex2f(left,top);
        glVertex2f(right,top);
        glVertex2f(right,bottom);
      glEnd();
  
      glFinish();
  }
  
  void Reshape(GLint w, GLint h)
  {
      Width = w;
      Height = h;
      glViewport(0, 0, w, h);
  
      glMatrixMode(GL_PROJECTION);
      glLoadIdentity();
      glOrtho(0, w, 0, h, -1.0, 1.0);
  
      glMatrixMode(GL_MODELVIEW);
      glLoadIdentity();
  }
  
  void Keyboard(unsigned char key, int x, int y)
  {
  #define ESCAPE '\033'
  
      if( key == ESCAPE )
          exit(0);
  }
  
  main(int argc, char *argv[])
  {
      glutInit(&amp;argc, argv);
      glutInitDisplayMode(GLUT_RGB);
      glutInitWindowSize(Width, Height);
      glutCreateWindow("Red square example");
  
      glutDisplayFunc(Display);
      glutReshapeFunc(Reshape);
      glutKeyboardFunc(Keyboard);
  
      glutMainLoop();
  }
  </code></pre>
  
  <p>The compile command is:</p>
  
  <pre><code>gcc -lGL -lGLU hw_opengl.cpp -o hw_opengl
  </code></pre>
  
  <p>I've got the following errors:</p>
  
  <pre><code>/tmp/ccbnBFHC.o: In function `Display()':
  hw_opengl.cpp:(.text+0x6c): undefined reference to `glClearColor'
  hw_opengl.cpp:(.text+0x78): undefined reference to `glClear'
  hw_opengl.cpp:(.text+0x94): undefined reference to `glColor3ub'
  hw_opengl.cpp:(.text+0xa0): undefined reference to `glBegin'
  hw_opengl.cpp:(.text+0xb4): undefined reference to `glVertex2f'
  hw_opengl.cpp:(.text+0xc8): undefined reference to `glVertex2f'
  hw_opengl.cpp:(.text+0xdc): undefined reference to `glVertex2f'
  hw_opengl.cpp:(.text+0xf0): undefined reference to `glVertex2f'
  hw_opengl.cpp:(.text+0xf5): undefined reference to `glEnd'
  hw_opengl.cpp:(.text+0xfa): undefined reference to `glFinish'
  /tmp/ccbnBFHC.o: In function `Reshape(int, int)':
  hw_opengl.cpp:(.text+0x134): undefined reference to `glViewport'
  hw_opengl.cpp:(.text+0x140): undefined reference to `glMatrixMode'
  hw_opengl.cpp:(.text+0x145): undefined reference to `glLoadIdentity'
  hw_opengl.cpp:(.text+0x173): undefined reference to `glOrtho'
  hw_opengl.cpp:(.text+0x17f): undefined reference to `glMatrixMode'
  hw_opengl.cpp:(.text+0x184): undefined reference to `glLoadIdentity'
  /tmp/ccbnBFHC.o: In function `main':
  hw_opengl.cpp:(.text+0x1c1): undefined reference to `glutInit'
  hw_opengl.cpp:(.text+0x1cd): undefined reference to `glutInitDisplayMode'
  hw_opengl.cpp:(.text+0x1e4): undefined reference to `glutInitWindowSize'
  hw_opengl.cpp:(.text+0x1f0): undefined reference to `glutCreateWindow'
  hw_opengl.cpp:(.text+0x1fc): undefined reference to `glutDisplayFunc'
  hw_opengl.cpp:(.text+0x208): undefined reference to `glutReshapeFunc'
  hw_opengl.cpp:(.text+0x214): undefined reference to `glutKeyboardFunc'
  hw_opengl.cpp:(.text+0x219): undefined reference to `glutMainLoop'
  collect2: ld returned 1 exit status
  </code></pre>
  
  <p>I've install GLUT:
  sudo apt-get install freeglut3 freeglut3-dev</p>
  
  <p>There are in /usr/lib:
  libglut.a<br>
  libglut.so<br>
  libglut.so.3<br>
  libglut.so.3.9.0 </p>
  
  <pre><code>locate glu.h
  /home/goran/QtSDK/QtSources/4.8.0/src/3rdparty/webkit/Source/ThirdParty/glu/internal_glu.h
  /usr/include/GL/glu.h
  
  /usr/include/GL/gl.h
  
  locate gl.h
  ...
  /usr/include/GL/gl.h
  </code></pre>
  
  <p>What do I do incorrectly?</p>