Nordic "nRF52840 Dongle" Support

Looking at .gitignore, it seems like most of the content of the nrf5x_15 folder is not present in git. Thus, I manually downloaded SDK 15 (as well as micro-ecc, under targetlibs/nrf5x_15/external/micro-ecc), so now the source code compiles, however the linker script is missing:

CC /home/uri/espruino/targetlibs/nrf5x_15/c­omponents/libraries/experimental_memobj/­nrf_memobj.o
make: *** No rule to make target '/home/uri/espruino/targetlibs/nrf5x_15/­nrf5x_linkers/linker_nrf52840_ble_esprui­no.ld', needed by 'espruino_1v99.154_nrf52840.elf'.  Stop.

Any pointers?