"rpm-based" isn't uniq, I checked it with opensuse, they called it iproute2
iproute --> iproute2
These variables can be used to control exactly where clatd gets installed. Requested by @ingvarha. Closes: #8
Don't assume that utilities such as systemctl or initctl is found in a certain specific path. Instead look for them in $PATH. This applies to both the Makefile and the NetworkManager dispatcher script. Resolves #11.