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I could port it to C if the project does not use the C++ keyword "class"; no idea if you could.

Yes, it is possible to mix C with C++ code.

NOTE: I said there where NO classes in the three...

FYI:

I glanced at the source code of libagf; and, the only C++ use that jumps out is the use of pass by reference (&).
I saw no classes in the three headers I checked.

Tim S.