Hi BSTRobin, As per my message above, I am using the ESP32 rather than ESP8266 have followed the steps to modify the platform.txt using v1.0.4 (released october 2019) of the espressifs arduino-esp32 core when I update to v1.0.6 (released March 2021) the process no longer works and I get the error when comiling from my original message. Other libraries etc. have no problem with the newer esp32 core and there is some features within the later core that can aid in reducing power consumption which is critical for my application. Any advice on getting the BSEC library to compile with the arduino-esp32 core(v1.0.6) would be much appreciated. Kind Regards, Glen
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