title: Visual Studio - Where to define custom path macros?
body: <p>I just opened someone else's Visual Studio project and in their build properties they have a few custom path macro's they are using for their include and lib directories. The macro names are things like this:</p>
  
  <p><code>$(MY_WHATEVER_INCLUDE_DIR)</code></p>
  
  <p>I could manually replace every single macro with the real path, but it would be nice to just use the macros. My question is, where do I define these custom path macros at?</p>