Link to an *.a file

Projects Programming
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I am trying to follow this tutorial here
https://techtutorialsx.com/2020/06/13/esp32-camera-face-detection/
It's about face detection in an ESP32cam

I have managed to find some source files which seem to belong together as a matching set from around the date of his tutorial. They are zipped I have attached the ZIP.

No I haven't - I'm not allowed to! Any suggestions? Create a Github page??

The INO file compiles but the linker is unhappy because it can't find a dozen or so functions:
undefined reference to pnet_lite_q' undefined reference to dl_matrix3du_slice_copy'
undefined reference to rnet_lite_q_with_score_verify' undefined reference to onet_lite_q_with_score_verify'
etc.

There are headers for those functions in mtmn.h but their bodies are missing.

I believe those functions are in the archive file
libfd.a
I can see them if I look in the file with a hex viewer.

I'm running Arduino IDE 1.8.16 under Windows 8.

How do I tell the Arduino IDE to link to those functions? (I see other similar questions in this forum but none of the answers work for me.)

Thanks

Peter

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