Interfacing to C: const or immutable?

[Mathias Laurenz Baumann]

http://www.digitalmars.com/d/2.0/interfaceToC.html still says there is no  
const/immutable in D:

    There are no const or volatile type modifiers in D. To declare a C  
function that uses those type modifiers, just drop those keywords from the  
declaration.

but that is obviously out-dated. What should I use now, when interfacing  
with C?


--Marenz