Hi I tried the platform.txt file you shared now and still see same errors. I am running on Arduino 1.8.13 IDE. Any impact and should I upgrade it? sketch\basic_config_state.ino.cpp.o:(.literal._Z5setupv+0x2c): undefined reference to `bsec_get_version' sketch\basic_config_state.ino.cpp.o: In function `Bsec::getVersion()': sketch/bsec.h:186: undefined reference to `bsec_get_version' sketch/bsec.h:186: undefined reference to `bsec_get_version' sketch/bsec.h:186: undefined reference to `bsec_get_version' sketch/bsec.h:186: undefined reference to `bsec_get_version' sketch\bsec.cpp.o:(.literal._ZN4Bsec11beginCommonEv+0x0): undefined reference to `bsec_init' sketch\bsec.cpp.o:(.literal._ZN4Bsec18updateSubscriptionEP21bsec_virtual_sensor_thf+0x0): undefined reference to `bsec_update_subscription' sketch\bsec.cpp.o:(.literal._ZN4Bsec18updateSubscriptionEP21bsec_virtual_sensor_thf+0x4): undefined reference to `bme68x_init' sketch\bsec.cpp.o:(.literal._ZN4Bsec8getStateEPh+0x0): undefined reference to `bsec_get_state' sketch\bsec.cpp.o:(.literal._ZN4Bsec8setStateEPh+0x0): undefined reference to `bsec_set_state' sketch\bsec.cpp.o:(.literal._ZN4Bsec9setConfigEPKh+0x10): undefined reference to `bsec_set_configuration' sketch\bsec.cpp.o:(.literal._ZN4Bsec11processDataExRK11bme68x_data+0x0): undefined reference to `bsec_do_steps' sketch\bsec.cpp.o:(.literal._ZN4Bsec21setBme68xConfigForcedEv+0x0): undefined reference to `bme68x_set_conf' sketch\bsec.cpp.o:(.literal._ZN4Bsec21setBme68xConfigForcedEv+0x4): undefined reference to `bme68x_set_heatr_conf' sketch\bsec.cpp.o:(.literal._ZN4Bsec21setBme68xConfigForcedEv+0x8): undefined reference to `bme68x_set_op_mode' sketch\bsec.cpp.o:(.literal._ZN4Bsec23setBme68xConfigParallelEv+0x4): undefined reference to `bme68x_get_meas_dur' sketch\bsec.cpp.o:(.literal._ZN4Bsec3runEv+0x0): undefined reference to `bsec_sensor_control' sketch\bsec.cpp.o:(.literal._ZN4Bsec3runEv+0x4): undefined reference to `bme68x_get_data' sketch\bsec.cpp.o: In function `Bsec::beginCommon()': sketch/bsec.cpp:114: undefined reference to `bsec_init' sketch/bsec.cpp:114: undefined reference to `bsec_get_version' sketch\bsec.cpp.o: In function `Bsec::updateSubscription(bsec_virtual_sensor_t*, unsigned char, float)': sketch/bsec.cpp:151: undefined reference to `bsec_update_subscription' sketch/bsec.cpp:155: undefined reference to `bme68x_init' sketch\bsec.cpp.o: In function `Bsec::getState(unsigned char*)': sketch/bsec.cpp:244: undefined reference to `bsec_get_state' sketch\bsec.cpp.o: In function `Bsec::setState(unsigned char*)': sketch/bsec.cpp:257: undefined reference to `bsec_set_state' sketch\bsec.cpp.o: In function `Bsec::setConfig(unsigned char const*)': sketch/bsec.cpp:274: undefined reference to `bsec_set_configuration' sketch\bsec.cpp.o: In function `Bsec::processData(long long, bme68x_data const&)': sketch/bsec.cpp:335: undefined reference to `bsec_do_steps' sketch\bsec.cpp.o: In function `Bsec::setBme68xConfigForced()': sketch/bsec.cpp:358: undefined reference to `bme68x_set_conf' sketch/bsec.cpp:372: undefined reference to `bme68x_set_heatr_conf' sketch/bsec.cpp:376: undefined reference to `bme68x_set_op_mode' sketch\bsec.cpp.o: In function `Bsec::setBme68xConfigSleep()': sketch/bsec.cpp:388: undefined reference to `bme68x_set_op_mode' sketch\bsec.cpp.o: In function `Bsec::setBme68xConfigParallel()': sketch/bsec.cpp:408: undefined reference to `bme68x_set_conf' sketch/bsec.cpp:414: undefined reference to `bme68x_get_meas_dur' sketch/bsec.cpp:422: undefined reference to `bme68x_set_heatr_conf' sketch/bsec.cpp:426: undefined reference to `bme68x_set_op_mode' sketch\bsec.cpp.o: In function `Bsec::run()': sketch/bsec.cpp:173: undefined reference to `bsec_sensor_control' sketch/bsec.cpp:201: undefined reference to `bme68x_get_data' collect2.exe: error: ld returned 1 exit status exit status 1 Error compiling for board Adafruit ESP32 Feather.
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