/usr/include/sys/un.h/usr/include/rpc/types.h/usr/include/math.h
/usr/include/sys/un.hsuch a file does not exist on Interactive. You may like to generate it, if you don't like a warning from depend. It isn't needed to compile the sources successfully.
You could use the following to produce it:
#ifndef X_NO_SYS_UN
struct sockaddr_un {
short sun_family; /* AF_UNIX */
char sun_path[108]; /* path name (gag) */
};
#endif
/usr/include/sys/un.h/usr/include/rpc/types.h/usr/include/math.h