anchor.diff:  Profiles are written in YAML. Here is an example:
   
   [source,yaml]
  +----
   build-env:
     CFLAGS: -O0 -g3
   virt-env:
  
positive.code: == Update a project with a Git source
  
  `vlttng` generates the following scripts in the virtual environment's
  root directory (+__name__+ is the project name):
  
  +conf-__name__.bash+::
      Runs the configuration step of the project.
  
  +build-__name__.bash+::
      Runs the build step of the project.
  
  +install-__name__.bash+::
      Runs the install step of the project.
  
  +update-__name__.bash+ (only with a Git source)::
      Fetches the project's configured Git remote, checks out the latest
      version of the configured branch, and runs +conf-__name__.bash+,
      +build-__name__.bash+, and +install-__name__.bash+.
  
  IMPORTANT: Use those scripts with caution. For a stable branch, they
  should work most of the time. For the `master` branch, some required
  
negative.code: By default, `vlttng` hides the standard output and error of the commands
  it runs. In this mode, `vlttng` prints all the commands to run and the
  exported environment variables along with comments, so that you can
  "`replay`" the entire output as is to create the same virtual
  environment (except for the `activate` script which would not be
  generated).
  
  