(ct:cref :long a-test) ?

I am trying to access a variable of type :long which I have created 
using...

(setf value (ct:malloc (ct:sizeof :long)))

... however when I try to use cref, I get the following error ...

(ct:cref :long value)

;;; An error occurred in function MACROEXPAND:
;;; Error: Cannot access C type LONG using CREF

Basically, I am trying to call a fuction that requires a pointer as 
a parameter...

int SDL_GL_GetAttribute(SDLGLattr attr, int *value);

... which I can do, however I don't know how to access the *value 
because of the problem described above.


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