nRF52840DK build error: src/jslex.o make: *** [espruino_2v08.220_nrf52840.elf] Error 1

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Gordon
Here, you are building a file designed to run on your PC, not a microcontroller. It'll be a 64 bit x86 build:
```
make clean && make
```
Here you're building a binary file to run on the Espruino Wifi's ARM, but because you didn't clear the build, some files will have been built for the wrong platform:
```
BOARD=ESPRUINOWIFI make
```
You also need to build with RELEASE=1. It seems there are pretty clear instructions at https://github.com/espruino/Espruino/blob/master/README_Building.md#for-stm32-boards-incl-espruino-board

So if you run the command listed there:
```
make clean && BOARD=ESPRUINOWIFI RELEASE=1 make
```
you may have more success

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