Interfacing with C is actually a lot of work. Not that it is not possible, but if you write a light wrapper, you end up with all the low-levelness that makes up C.

If you want to use a C library „the Ada way“, you need to wrap almost every C function with an Ada function that transforms C pointers into Ada arrays (remember, [] in C is just a pointer with no dope), C defines into Ada enumerations, C function pointers to Ada subprogramm access types and so on.

This amounts to a lot of work. For example, my OpenGL Ada wrapper is roughly 10,000 lines of code. But it does do extension loading and resource management automatically (in contrast with the raw C API) and all defines have been translated to enum values so you can call functions only with values they can handle.