title: G++ openGL application under Cygwin
body: <p>I looked at <a href="https://stackoverflow.com/questions/14344/starting-off-with-opengl-under-cygwin">this post</a>, but it did not help. Builder returns me this:</p>
  
  <pre><code>/cygdrive/c/Users/Itun/workspace/VoxEngine/Debug/../src/main.cpp:30: undefined reference to _glEnable
  /cygdrive/c/Users/Itun/workspace/VoxEngine/Debug/../src/main.cpp:31: undefined reference to _glClearColor'`.
  </code></pre>
  
  <p>What do <code>-lglut32 -lglu32 -lopengl32</code> flags mean? Where are the libs?</p>
  
  <p>How to create OpenGL project under Cygwin with Eclipse?</p>
  
  <p><strong>UPDATE</strong>:
  I add -I/usr/include/opengl to g++ and it starts to work. In this folder there is a single file GL.dll. How does this dll influence to the compilation?</p>