- This way, we don't need to provide a README file, now that we start to
  switch to README.md for markdown readme on gitlab
- "[..] differences between the gnu and foreign flavours is
  that the former requires the presence of a number of files in the
top-level of the projects": https://autotools.io/automake/options.html
- It also stop warning when using GNU make syntax, but we already
  mandate gnu make, so it's not a problem