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	https://github.com/esp8266/Arduino/issues/3481#issuecomment-482293996
https://github.com/d-a-v/esp82xx-nonos-linklayer/pull/33
it was removed by error on 9 oct 2018 a1e59e9c01 (diff-8a46852651388faec204ec21c86b8098L586)
		
	
warning: this directory is re/over/written from lwip2 builder upon lwip2 rebuild