example(s) how to work with C code from C2

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hello

this is request for example(s) how to work with C code from C2 --
how to use gmplib from C2, for example

thank you :)

upd. better will be to see at least two examples -- for example --
1st simple with how to use gmplib from C2
2nd more complex with how to use raylib from C2 - some mini-game example