Espruino Build issues using README_BuildProcess.md and Extending+Espruino+1 within Windows10 environment

Sun 2019.10.06

At it again, but still struggling. Followed the step-by-step VSCode WSL terminal window entry using the lines beneath the 'for Espruino' heading, starting with:

rgc@DESKTOP-R7T0VUC:/mnt/c/Users/robin$ cd ~
rgc@DESKTOP-R7T0VUC:~$

sudo apt-get update

Am able to edit a .c file and observe that it changes the local file at:

C:\Users\robin\Espruino\src

and, Python installed correctly this time along with git and pip

but, running the make command line, isn't providing a .hex file in:
make clean && make

C:\Users\robin\Espruino\gen

Confirming the above is the folder where the .hex and .bin files will end up?

rgc@DESKTOP-R7T0VUC:~/source/repos/github/espruino/Espruino$

Is this terminal window output what is observed during the 'Rookie' mistake? That is, the install is still in the wrong location?

EDIT:
Just tried BOARD=PICO_R1_3 make

rgc@DESKTOP-R7T0VUC:~/source/repos/github/espruino/Espruino$ BOARD=PICO_R1_3 make
CC /home/rgc/source/repos/github/espruino/Espruino/targetlibs/stm32f4/lib/startup_stm32f401xx.o
make: arm-none-eabi-gcc: Command not found
Makefile:763: recipe for target '/home/rgc/source/repos/github/espruino/Espruino/targetlibs/stm32f4/lib/startup_stm32f401xx.o' failed
make: *** [/home/rgc/source/repos/github/espruino/Espruino/targetlibs/stm32f4/lib/startup_stm32f401xx.o] Error 127

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