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RAYMATH_EXTERN_INLINE was renamed to RAYMATH_HEADER_ONLY, which user code may define if they want to use it as header-only library. If multiple files in the same project define RAYMATH_HEADER_ONLY, they might each have duplicate out-of-line definitions of the same functions. By default, raymath.h exposes inline definitions, which instructs the compiler _not_ to generate out-of-line definitons, if out-of-line definitions are required, those of the file defined with RAYLIB_IMPLEMENTATION are used instead. There may be only one such file. In C++ mode, the compiler will select only one out-of-line definition automatically, so no need to define a RAYLIB_IMPLEMENTATION. Unfortunately, we have to remove raymath function declaration from raylib.h as those declarations would lead to duplicate out-of-line definitions which would yield linker errors. This problem didn't exist with GNU89 or C++, because there multiple defintions are ok, but in C99 they aren't.