Comment by Peter - Reinstate Monica on How do I compile code that uses both Physac and Raylib, which both define Vector2 struct?

@Caner-sagopaninsagkolu OK, that's a link error. The code sees the declarations, the compiler produces the proper calls, but the linker cannot resolve them. You need to add the libraries or .c files from physac which contain the implementations to your project. Hint: RTFM ;-).