ES 1.x (experimental)</li>
<li><code>_GLFW_USE_GLESV2</code> for OpenGL ES 2.x (experimental)</li>
</ul>
<p>Note that <code>_GLFW_USE_GLESV1</code> and <code>_GLFW_USE_GLESV2</code> may only be used with EGL, as the other context creation APIs do not interface with OpenGL ES client libraries.</p>
<p>If you are building GLFW as a shared library / dynamic library / DLL then you must also define <code>_GLFW_BUILD_DLL</code>. Otherwise, you may not define it.</p>
<p>If you are using the X11 window creation API 