anchor.diff:  ----
   
   When you give multiple profiles to `vlttng`, the first profile is
  -``patched'' with the second, which is then patched with the third, and
  +"`patched`" with the second, which is then patched with the third, and
   so on. Nonexistent properties are created; existing ones are replaced
   recursively. The `configure` properties are _joined_. For example, let's
   add the following profile (call it `more.yaml`) to the example above:
   
   [source,yaml]
  +----
   build-env:
     CFLAGS: -O0
     SOMEVAR: ok
  
positive.code:     checkout: stable-2.7
    urcu:
      source: 'git://git.liburcu.org/userspace-rcu.git'
  
  A few things to note here:
  
  
negative.code:   contained within the virtual environment.
  
  . It creates an `activate` script which you can _source_ from your
    Bash/Zsh prompt to "`enter`" the virtual environment. This script sets
    a few environment variables, like `PATH`, `LD_LIBRARY_PATH`, and
    `PYTHONPATH`, to achieve this. By default, it also prepends the name
    of the virtual environment directory to your shell prompt for you to
  