anchor.diff:  from a environment variable +CPPPATH+, you can say +$(CPPPATH:p-I)+.
   
   .Interpolation Syntax
  -[width="90%",cols="1,9",options="header"]
  +[width="90%",cols="4,9",options="header"]
   |=============================================================================
   |Syntax                 |Effect
   |+$(VAR:f)+             |Convert to forward slashes (+/+)
  
positive.code: same multi-MLOC codebase is not uncommon. Each second spent by a build system
  not building wastes productivity, especially when there are thousands of builds
  every day!
  
  === Design Philosphy ===
  
  
negative.code: 
  Then interpolating the following strings will give the associated result:
  
  [width="90%",cols="4,9",options="header"]
  |=============================================================================
  |Expression             |Resulting String
  |`$(FOO)`               |`String`
  