How to use C function to calculate GPG keygrip

I'm new/terrible in C language... so my general question is:

How do I use "already existing" functions in C used in programs such as GPG or other unix programs?

(More specific) Problem: I have a GPG key, but newer version does not support the common options --with-keygrip. Therefore I wonder: How do I use C function like: unsigned char * gcry_pk_get_keygrip

GNUPG Manual


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