Looking at your screenshot, it looks like your main file is BlinkM.cpp... that seems odd to me. Maybe you're trying to compile the wrong thing? Make sure you're working with Marlin.ino.
Last year I spent some time going around these circles. I recorded my solution (for Ubuntu) here. Maybe there's somethere that's relevant to you?
Last year I spent some time going around these circles. I recorded my solution (for Ubuntu) here. Maybe there's somethere that's relevant to you?