I am new to Visual Micro.  It is currently running in Visual Studio 2017 
(community) on my machine.

Using the build button I always get an error in "Building core..." , there is a 
parameter -I"" in the line.  If I cut the line out, drop it into a cmd file, remove 
the -I"" and run it then it works.

I have created new projects with nothing in them - get the error.  An existing 
project from a co-worker, builds on his machine fails on mine, same problem.
He does not get the -I"" parameter.

Where does that avr-gcc line get generated, where does the empty include 
come from?  Any one see this before?