> How do you prototype a function that returns a pointer to a function that
> returns a pointer to a function?

For me, this kind of complex definition is best done with a couple of
extra typedefs.  It still makes my brain hurt, but not as much as
Simon's does.

typedef int (*BASEFUNC_T)(int, int);
typedef BASEFUNC_T (*RETFUNC_T) (char *);

Your prototype:
   RETFUNC_T fn (int *, char **, void *);

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