[Chicken-users] foreign-lambda declaration for char**?

[.alyn.post.]

I have the following C function:

  extern void svec_free(char **v);

And I want to call it from Scheme, so I say:

  (define svec-free
    (foreign-lambda void "svec_free" (c-pointer c-pointer)))

But the above (c-pointer c-pointer) declaration is a void**, not a
char**, so I get the following warning:

  warning: passing argument 1 of 'svec_free' from incompatible pointer type

What is the magic phrase to tell foreign-lambda a parameter is a
char**?

-a
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