title: Environment variables in Visual Studio 2013
body: <p>I'm trying to set my project include to the path <code>%OPENCV_246%\..\..\include</code></p>
  
  <p>This resolves to the path <code>F:\dev\opencv_246\build\include</code></p>
  
  <p>However, when setting the project includes, that path will not resolve and as a result the included headers break. </p>
  
  <p>I've tried both <code>%OPENCV_246%\..\..\include</code> and <code>$(OPENCV_246)\..\..\include</code> with no luck.</p>
  
  <p>Using the path directly fixes my includes, but I'd like to have a better way of managing the path through environment variables.</p>
  
  <p>In the screenshot I've added both for clarity, If anyone could point out the step I'm missing here I'd appreciate it.</p>
  
  <p>EDIT: Variable <code>OPENCV_246</code> contains value <code>F:\dev\opencv_246\build\x86\vc11</code></p>
  
  <p><img src="https://i.stack.imgur.com/LIcFt.png" alt="screenshot"></p>