to include <code>windows.h</code> before including <code>GL/gl.h</code>. This would make your source file tied to Windows and pollute your code's namespace with the whole Win32 API.</p>
<p>Instead, the GLFW header takes care of this for you, not by including <code>windows.h</code>, but rather by itself duplicating only the necessary parts of it. It does this only where needed, so if <code>windows.h</code> <em>is</em> included, the GLFW header does not try to redefine those symbols.</p>
<p>In other words:</p