[theothershoe]

Good point - cross platform issues are a concern. I've noticed in the past that OS X machines tend to run older versions of Make (unless the owner has installed a newer version with Homebrew). It is a good idea to pay attention to the Make features that you use, understand which features were added in recent versions, and be aware of which features are specific to GNU Make. In my projects I recommend that users make sure that they are in fact using GNU Make.

Some systems might not support the `-p` flag in `mkdir -p`, or the `-rf` flags in `rm -rf`. There are scripts distributed on NPM called `mkdirp` and `rimraf` to work around such issues.