title: How do I modify Visual Studio 2015 predefined macros?
body: <p>I'm trying to modify a predefined environment macros in Visual Studio 2015. Specifically this: <strong><em>VC_IncludePath</em></strong></p>
  
  <p>I can see it and its value, but I can not modify it. I don't see the option to do it.</p>
  
  <p><a href="https://i.stack.imgur.com/uIW7z.jpg" rel="nofollow"><img src="https://i.stack.imgur.com/uIW7z.jpg" alt="Enter image description here"></a></p>