The following errors are seen when attempting to install the RealPort driver in Linux:
make: Entering directory `/usr/src/dgrp-1.9/dinc'
make: *** No rule to make target `dinc.o', needed by `dinc'. Stop.
This is typically seen if the user is not logged in with the root environment variables. If using su to switch user, be sure and add the hyphen (-) for the environment:
$ su -
Aug 08, 2017