A change All drivers are implemented using a .deb package. The following will provide detail on installation and on the individual drivers.
First compile the package
cd wand_iolib
make dep-pkg
Then install
sudo dpkg -i tmp/danbots-wand-iolib-x.deb
This should install all necessary packages with no further configuration.
preinstall configures all of the various dtoverlays by scanning /boot/config.txt and injecting the overlay configuration if not already present. It does this at the end under [All].
Copies libraries to /usr/local/lib/wand/iolib/ and overlay files from /usr/local/lib/wand/iolib/ to /boot/overlay in order for them to be available in $PATH and /boot/config.txt respectively.
The .deb package is comprised of multiple individual packages and drives.