X header help

[Lucas Goss]

Has anyone translated X C headers to D? I have X.h done and Xlib.h is 
partly done.

Anyways, I've run into some code that I'm not sure how to translate it to D.

//----------
typedef void (*XIMProc)(
     XIM,
     XPointer,
     XPointer
);

// then later a struct which uses the above function pointer

typedef struct {
     XPointer client_data;
     XIMProc callback;
} XIMCallback;
//----------

I translated the it as:
//----------
void function(XIM, XPointer, XPointer) XIMProc;

struct XIMCallback
{
	XPointer client_data;
	// XIMProc callback; ??? nope.
	// void* callback = XIMProc(); ??? nope.
}
//----------

Obviously it failed to compile, but I'm not sure how to translate it.