title: Where can I get GL3/gl3.h on Ubuntu or probably it is deprecated?
body: <p>If I <a href="https://developernote.com/2017/08/building-osgearth-on-ubuntu-14-04/" rel="nofollow noreferrer">build some open source library configured to use OpenGL 3 on Ubuntu</a>, its CMake generates a header file containing </p>
  
  <pre><code>#include &lt;GL3/gl3.h&gt;
  </code></pre>
  
  <p>but GL3/gl3.h does not exist on my system. If I replace GL3/gl3.h with GL/gl.h, the library compiles and works fine. I <a href="https://github.com/openscenegraph/OpenSceneGraph/issues/305" rel="nofollow noreferrer">reported this situation to the library owners</a>, but they said that I should have this GL3/gl3.h. Also there is an <a href="https://stackoverflow.com/questions/10400072/no-opengl-3-headers-in-arch-linux">answer telling that GL3/gl3.h is deprecated</a>. Where can I get GL3/gl3.h? And isn't it deprecated?</p>