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There are completely stand-alone systems like:

https://NN-512.com

The stand-alone code generator (a statically linked executable written in Go with no dependencies outside the Go standard library) generates stand-alone POSIX C code for the neural net, requiring only gcc to compile.

Also see Fabrice Bellard's LibNC:

https://bellard.org/libnc/

C API. Small library, no external dependencies, available for Linux and Windows.