anchor.diff:  
   S2I can perform incremental builds, which means it reuses artifacts from
   previously-built images. To create an incremental build, create a
  -`*buildConfig*` with the following modification to the strategy definition:
  +`*BuildConfig*` with the following modification to the strategy definition:
   
   ====
   
  
positive.code: 
  == Source Code
  The source code location is one of the required parameters for the
  `*buildConfig*`. The build uses this location and fetches the source code that
  is later built. The source code location definition is part of the
  `*parameters*` section in the `*buildConfig*`:
  
  ====
  
  
negative.code: There are two ways to make environment variables available to the
  link:../architecture/core_concepts/builds_and_image_streams.html#builds[source build]
  process and resulting \image: link:#environment-files[environment files] and
  link:#buildconfig-environment[*BuildConfig* environment] values.
  
  [[environment-files]]
  
  