You might be better off asking on the GRBL or Arduino etc forums. Sounds like a specific issue that somebody may have come up against before or at least understand the problem.

Murray

It seems grbl has a slightly unusual install mechanism : if I read it correctly, the source files are loaded into a project folder in the usual way from zip, but are then compiled via grblupload in the examples folder, not directly.

Are you following the instructions here? Judging by the comments it is important to follow the instructions exactly. Which model Arduino and what's the error message?

I'll try it myself in a moment and see how I get on!

I loaded grbl onto an Arduino a couple of years ago. I used the instructions from NYCNC https://www.youtube.com/watch?v=1ioctbN9JV8.

Or perhaps tonight.

Took me no more than 5 minutes to download the zip from git to my Windows 10 laptop and install it as an Arduino library following the instructions I linked to above and to flash it on to a real Arduino Uno R3. I have Arduino IDE v1.8.4.

So it does work. I had trouble doing the same thing earlier with Ubuntu because the zip package fails validation as a library and breaks the install. (This is a known Issue, and you don't get as far as bening allowed to compile anything, so probably not Peter's problem.)

Any other clues Peter?

Dave