Sparkfun nRF52832

How to run the sdk examples from usb on the Sparkfun. I can run the adruino code, but want to shift to a more standard production environment. After manual install of GCC I can compile by "make" and when I run "make flush" get: make: *** No rule to make target `flush'. Stop.

How this can be solved. My main target now is to run the blinky example from MacOS usb to the sparkfun Breakout board. Very new to this. So maybe there is some basic misconception. Thanks for the helpers