It seems like your project includes a mix of old and new code. 'BSEC_OUTPUT_IAQ_ESTIMATE' is an old name, which became 'BSEC_OUTPUT_IAQ' in the meantime (at least it is the case now in BSEC v1.4.7.4). It is likely that you have to update a bit more code in your project, maybe also bsec_integration.c/.h?
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