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If you actually use the library, sure, I guess. How you are going to get it running on online compilers, I have no idea. It's very uninteresting for others to view some code using a custom library though... you'd be golfing "single player".

Your answer here is doesn't use the library and is against the rules IMO:

https://codegolf.codidact.com/posts/279147?sort=age&page=1#answer-282484

Because you don't use some library, you just defined a function-like macro and then don't count characters in that macro. That can obviously not be alloweded, or otherwise I can easily beat you:

# [C (clang)], 1 byte

<!-- language-all: lang-c -->

    M

[Try it online!][TIO-kqkmu1g5]

[C (clang)]: http://clang.llvm.org/
[TIO-kqkmu1g5]: https://tio.run/##S9ZNzknMS/@vnJmXnFOakqpgU1ySkpmvl2HHpZySmpaZl6rgq8CVmVeikJuYmaehWc2lAAQFpSXFGkoeqTk5@ToK4flFOSmKSprWXLX/ff//BwA "C (clang) – Try It Online"

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The only sensible rule is that all C contributions using macros have to post the macro as part of the counted code.