Pan-Tompkins QRS detection problem

Hi all.

I have a problem when employing QRS peak detection library on github to my NRF52840 board.

i just add the PanTompkin.c and PanTompkin.h into my project without any modification, but when i first compile the code it comes to an error like below:

What just happen? I don't understand this library deep enough. Should i add something more into or modify something else?

Thanks in advance

The github link:

https://github.com/hooman650/Pan-Tompkins-FixedPoint

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