[dbbolton]

From the documentation page:

>A package directory is the root of a tree containing the installation image for a particular package. Each package directory must reside in a stow directory — e.g., the package directory /usr/local/stow/perl must reside in the stow directory /usr/local/stow. The name of a package is the name of its directory within the stow directory — e.g., perl.

https://www.gnu.org/software/stow/manual/stow.html

The article in the OP also doesn't use this format. Instead it's prefaced with a `cd` command, so you would need to do:

    cd foo; stow bar