#pragma once
// No need to include lib2.h or lib3.h here unless their types/functions
// are part of lib1.h's public interface. For simple calls in lib1.c,
// including in lib1.c is sufficient.

#if defined(__cplusplus)
extern "C" {
#endif

void lib1_function(unsigned int i);

#if defined(__cplusplus)
}
#endif