anchor.diff:  
   The following standard profiles are shipped with the project:
   
  -    all-master.yml
  -    babeltrace-master.yml
  -    babeltrace-python.yml
  -    babeltrace-stable-1.2.yml
  -    babeltrace-stable-1.3.yml
  -    babeltrace-stable-1.4.yml
  -    elfutils-0.166.yml
  -    glib-2.22.5.yml
  -    glib-2.23.6.yml
  -    glib-2.24.2.yml
  -    glib-2.25.17.yml
  -    glib-2.26.1.yml
  -    glib-2.27.93.yml
  -    glib-2.28.8.yml
  -    glib-2.29.92.yml
  -    glib-2.30.3.yml
  -    glib-2.31.22.yml
  -    glib-2.32.4.yml
  -    glib-2.33.14.yml
  -    glib-2.34.3.yml
  -    glib-2.35.9.yml
  -    glib-2.36.4.yml
  -    glib-2.37.93.yml
  -    glib-2.38.2.yml
  -    glib-2.39.92.yml
  -    glib-2.40.2.yml
  -    glib-2.41.5.yml
  -    glib-2.42.2.yml
  -    glib-2.43.92.yml
  -    glib-2.44.1.yml
  -    glib-2.45.8.yml
  -    glib-2.46.2.yml
  -    glib-2.47.92.yml
  -    glib-2.48.1.yml
  -    glib-master.yml
  -    libxml2-2.8.0.yml
  -    libxml2-2.9.0.yml
  -    libxml2-2.9.1.yml
  -    libxml2-2.9.2.yml
  -    libxml2-2.9.3.yml
  -    libxml2-master.yml
  -    lttng-analyses-0.3.0.yml
  -    lttng-analyses-0.4.0.yml
  -    lttng-analyses-0.4.1.yml
  -    lttng-analyses-0.4.2.yml
  -    lttng-analyses-0.4.3.yml
  -    lttng-analyses-0.5.0.yml
  -    lttng-analyses-0.5.1.yml
  -    lttng-analyses-0.5.2.yml
  -    lttng-analyses-0.5.3.yml
  -    lttng-analyses-0.5.4.yml
  -    lttng-analyses-master.yml
  -    lttng-master.yml
  -    lttng-modules-master.yml
  -    lttng-modules-stable-2.6.yml
  -    lttng-modules-stable-2.7.yml
  -    lttng-modules-stable-2.8.yml
  -    lttng-stable-2.6.yml
  -    lttng-stable-2.7.yml
  -    lttng-stable-2.8.yml
  -    lttng-tools-master.yml
  -    lttng-tools-no-lttng-consumerd.yml
  -    lttng-tools-no-lttng-crash.yml
  -    lttng-tools-no-lttng-relayd.yml
  -    lttng-tools-no-lttng-sessiond.yml
  -    lttng-tools-no-lttng.yml
  -    lttng-tools-no-man-pages.yml
  -    lttng-tools-no-python.yml
  -    lttng-tools-python.yml
  -    lttng-tools-stable-2.6.yml
  -    lttng-tools-stable-2.7.yml
  -    lttng-tools-stable-2.8.yml
  -    lttng-ust-jul-agent.yml
  -    lttng-ust-log4j-agent.yml
  -    lttng-ust-master.yml
  -    lttng-ust-no-man-pages.yml
  -    lttng-ust-python-agent.yml
  -    lttng-ust-stable-2.6.yml
  -    lttng-ust-stable-2.7.yml
  -    lttng-ust-stable-2.8.yml
  -    tracecompass-1.1.0.yml
  -    tracecompass-1.2.0.yml
  -    tracecompass-1.2.1.yml
  -    tracecompass-2.0.0.yml
  -    tracecompass-master.yml
  -    urcu-master.yml
  -    urcu-stable-0.7.yml
  -    urcu-stable-0.8.yml
  -    urcu-stable-0.9.yml
  +----
  +all-master.yml
  +babeltrace-master.yml
  +babeltrace-python.yml
  +babeltrace-stable-1.2.yml
  +babeltrace-stable-1.3.yml
  +babeltrace-stable-1.4.yml
  +elfutils-0.166.yml
  +glib-2.22.5.yml
  +glib-2.23.6.yml
  +glib-2.24.2.yml
  +glib-2.25.17.yml
  +glib-2.26.1.yml
  +glib-2.27.93.yml
  +glib-2.28.8.yml
  +glib-2.29.92.yml
  +glib-2.30.3.yml
  +glib-2.31.22.yml
  +glib-2.32.4.yml
  +glib-2.33.14.yml
  +glib-2.34.3.yml
  +glib-2.35.9.yml
  +glib-2.36.4.yml
  +glib-2.37.93.yml
  +glib-2.38.2.yml
  +glib-2.39.92.yml
  +glib-2.40.2.yml
  +glib-2.41.5.yml
  +glib-2.42.2.yml
  +glib-2.43.92.yml
  +glib-2.44.1.yml
  +glib-2.45.8.yml
  +glib-2.46.2.yml
  +glib-2.47.92.yml
  +glib-2.48.1.yml
  +glib-master.yml
  +libxml2-2.8.0.yml
  +libxml2-2.9.0.yml
  +libxml2-2.9.1.yml
  +libxml2-2.9.2.yml
  +libxml2-2.9.3.yml
  +libxml2-master.yml
  +lttng-analyses-0.3.0.yml
  +lttng-analyses-0.4.0.yml
  +lttng-analyses-0.4.1.yml
  +lttng-analyses-0.4.2.yml
  +lttng-analyses-0.4.3.yml
  +lttng-analyses-0.5.0.yml
  +lttng-analyses-0.5.1.yml
  +lttng-analyses-0.5.2.yml
  +lttng-analyses-0.5.3.yml
  +lttng-analyses-0.5.4.yml
  +lttng-analyses-master.yml
  +lttng-master.yml
  +lttng-modules-master.yml
  +lttng-modules-stable-2.6.yml
  +lttng-modules-stable-2.7.yml
  +lttng-modules-stable-2.8.yml
  +lttng-stable-2.6.yml
  +lttng-stable-2.7.yml
  +lttng-stable-2.8.yml
  +lttng-tools-master.yml
  +lttng-tools-no-lttng-consumerd.yml
  +lttng-tools-no-lttng-crash.yml
  +lttng-tools-no-lttng-relayd.yml
  +lttng-tools-no-lttng-sessiond.yml
  +lttng-tools-no-lttng.yml
  +lttng-tools-no-man-pages.yml
  +lttng-tools-no-python.yml
  +lttng-tools-python.yml
  +lttng-tools-stable-2.6.yml
  +lttng-tools-stable-2.7.yml
  +lttng-tools-stable-2.8.yml
  +lttng-ust-jul-agent.yml
  +lttng-ust-log4j-agent.yml
  +lttng-ust-master.yml
  +lttng-ust-no-man-pages.yml
  +lttng-ust-python-agent.yml
  +lttng-ust-stable-2.6.yml
  +lttng-ust-stable-2.7.yml
  +lttng-ust-stable-2.8.yml
  +tracecompass-1.1.0.yml
  +tracecompass-1.2.0.yml
  +tracecompass-1.2.1.yml
  +tracecompass-2.0.0.yml
  +tracecompass-master.yml
  +urcu-master.yml
  +urcu-stable-0.7.yml
  +urcu-stable-0.8.yml
  +urcu-stable-0.9.yml
  +----
   
   You can get this list using `vlttng --list-default-profiles`.
   
  
positive.code: 
  With this command:
  
      vlttng -p my-profile.yml -p more.yaml virt
  
  the effective profile is:
  
  
negative.code:   variables. They are set when building the projects. Exported shell
    variables are also passed to the executed programs, so you can do:
  +
  --
  ----
  CC=clang CFLAGS='-O0 -g3' vlttng ...
  ----
  --
  
  * The root `virt-env` property defines the virtual environment variables,
    which are set when activating the virtual environment. Exported
  