Immutable cannot be casted to const when using pointers

[Jeroen Bollen]

On Tuesday, 8 April 2014 at 21:53:58 UTC, Steven Schveighoffer 
wrote:
> The rule of thumb is, 2 or more references deep does not 
> implicitly convert. One reference deep is OK.
>
> -Steve

For some reason I was expecting that to rhyme. :P

Anyways thanks all, makes sense now. Are there any workarounds? 
The function taking the const int** is external(C) so I'm not 
sure what to do.